How do I hollow a model to save resin?

In Chitubox or Lychee Slicer, use the Hollow tool to set wall thickness (1.5 to 2mm), then add drain holes of at least 3mm diameter. Hollowing a solid 30mm object with a 1.5mm shell can reduce resin use by 60 to 73 percent. The hollowing calculator on this page estimates your volume reduction before you modify the model.

Is resin 3D printing safe to do indoors?

The U.S. EPA identifies resin 3D printing as a source of VOC emissions including acrylate monomers that can be respiratory irritants with prolonged exposure. Always print with active ventilation, wear nitrile gloves when handling uncured resin, and keep the vat covered when not printing. See EPA.gov for the full 3D printing research program.

🧪 Resin Volume Calculator

Resin Volume Calculator for SLA, MSLA and DLP 3D Printers

Q: How much resin does a typical 28mm miniature use?

A solid 28mm miniature uses 3.5 to 5.5 mL of resin. With light supports and safety buffer, plan for 4.2 to 6.6 mL. Hollowing to a 1.5mm shell reduces this to 1.2 to 2.0 mL of actual wall material.

Q: How do I convert resin mL to grams for purchasing?

Multiply volume in mL by the resin density in g/mL. Standard photopolymer resin has density approximately 1.10 g/mL, so 25 mL weighs 27.5 grams. Engineering resin at 1.18 g/mL: 25 mL weighs 29.5 grams. The resin type selector in this calculator handles all conversions automatically.

Two modes: Volume Planner tells you exactly how much resin to pour before every print. Cost Calculator breaks down material, electricity, IPA wash, and FEP wear into a true cost per print. Includes 12 printer presets with vat priming data and a hollowing mode that saves 50 to 80 percent of your resin.

✔ 12 Printer Presets + Vat Data

✔ Hollow Model Volume Calculator

✔ Batch Plate Planner

✔ 10 Resin Types + Density

✔ FEP + IPA Cost Included

✔ PDF Report + WhatsApp

Printer

Printer Model (auto-fills vat priming volume)

Model Volume

Input Method

Slicer Volume (from Chitubox, Lychee, or Voxeldance)

Hollow Model

Enable hollowing calculator

Shell Wall Thickness (1.5-2.5mm typical)

Smallest Dimension of Model (mm, for hollow ratio)

Add 2 to 4 drain holes (3mm minimum diameter) in your slicer to allow resin to escape during printing.

Supports and Safety

Support Density

Support Overhead (edit manually if needed)

Pieces on Plate (batch count)

pcs

Safety Buffer (extra resin for vat cling/waste)

Resin Type

Resin Type (for weight conversion)

⚠️

Safety reminder: The U.S. EPA identifies resin 3D printing as a source of VOC emissions including acrylate monomers. Always print with ventilation, wear nitrile gloves, and keep the vat covered when not printing.

🧪

Select your printer, enter the slicer volume or model dimensions, then tap Calculate Volume to see your exact pour amount and total resin weight.

Resin Usage

Slicer Volume Per Piece

Batch Quantity

pcs

Support Volume

Safety Buffer

Resin and Bottle

Resin Type

Bottle Price

Bottle Volume

Consumables

IPA / Wash Solution (per print session)

FEP Film Cost

FEP Lifespan (prints before replacement)

prints

Failure Rate

Electricity

Printer Wattage (resin: typically 50-85W)

Print Time

hrs

Electricity Rate (EIA 2026 US avg)

/kWh

💲

Enter slicer volume, resin bottle price, and consumables. The calculator breaks down your full cost per print including FEP wear, IPA wash, and failure buffer.

Resin Breakdown Chart

Volume Planner: model vs supports vs buffer vs vat priming. Cost mode: cost per component.

How Resin Volume Works in MSLA, SLA, and DLP Printing

Resin 3D printing is fundamentally different from FDM in how it consumes material. An FDM printer uses exactly the filament it extrudes, nothing more. A resin printer, by contrast, must maintain a pool of liquid photopolymer in the vat at all times. The resin does not flow from a spool on demand; it must be present in the vat from the very first layer to the very last, and the vat must hold enough to cover the FEP film completely across the build plate. This minimum pour volume is the hidden cost and planning challenge that every resin printer user discovers on their first failed print.

The total resin you need for any print session has four components: the volume of the actual printed object, the volume consumed by support structures, a vat priming minimum (which stays in the vat the entire print), and a safety buffer for resin that clings to the build plate, drips during removal, and adheres to the FEP during failed first layers. All four components must be in the vat before you press print.

Why Your Slicer Volume Is Never Enough

Chitubox, Lychee Slicer, and Voxeldance all display an estimated resin volume for your print, typically in milliliters. This number is accurate for the object and its supports, but it does not account for vat priming volume. On a small-format printer like the Elegoo Mars 3, you need a minimum of 60 mL in the vat to fully cover the FEP film before a single layer cures. If your slicer says the print uses 25 mL, you still need at least 60 mL in the vat. If you only pour 25 mL, the FEP will be exposed and dry on the edges, leading to incomplete cure on wide first layers and potential FEP damage.

For a large-format printer like the Elegoo Saturn 3 Ultra with its 218 x 123mm build plate, the minimum pour is approximately 125 mL just to protect the FEP. A print that uses only 30 mL of actual part volume still requires 125+ mL to be poured. This is why planning resin usage per print cannot be done purely from slicer output on large-format machines.

EPA health notice: The U.S. Environmental Protection Agency’s 3D Printing Research Program has identified resin (photopolymer) printing as a source of VOC emissions including acrylate monomers such as 2-HPMA, 2-HEMA, and isobornyl acrylate. These compounds can be skin sensitizers and respiratory irritants with prolonged exposure. The EPA and OSHA recommend adequate ventilation, nitrile gloves, and UV-protective eyewear whenever handling uncured resin. Print in ventilated spaces and keep the vat covered when not actively pouring or removing prints.

Volume Planning (Planner Mode)

Start with your slicer’s mL estimate or enter your model dimensions. Select your printer preset for the auto-filled minimum pour. Set support density (light 10%, medium 20%, heavy 35%) and a 10% safety buffer. Enter batch count for plate fills.

Output: exact mL to pour, total weight in grams (by resin type density), and a breakdown of where the volume goes.

Cost Analysis (Cost Mode)

Resin is sold by volume (mL) but its price varies wildly. Standard PLA-gray from Elegoo runs $20 to $30 per 500mL. Engineering resin from Siraya Tech or Phrozen can reach $65 to $90 per 500mL. Dental-grade resin from Formlabs or SprintRay exceeds $150 per 500mL.

The Cost mode adds FEP film wear, IPA wash solution, electricity, and failure buffer on top of raw resin cost for a true per-print total.

The Vat Priming Problem Every Resin Printer Owner Faces

The vat priming volume is determined by two things: the build plate area (which sets how large a surface the FEP needs to cover) and the depth of resin needed to allow the FEP film to flex slightly during the peeling motion without sucking air. Community-measured minimum pour volumes for popular US printers vary from 60 mL on a compact Mars-class machine to over 200 mL on the Anycubic Photon M3 Max with its 300 x 164mm build plate.

There is a second, less obvious priming consideration: resin left in the vat after a print session. Unless you are printing again within a day or two, leftover resin in an open or loosely covered vat will begin to ambient-cure near the edges from any UV light exposure (room light, indirect sunlight through windows), and pigment particles will settle and stratify. The best practice is to filter leftover resin back into its opaque bottle using a paint strainer cone immediately after printing. This preserves the resin, reduces partial cure contamination, and means you start every new session with accurately measured volume rather than guessing how much mystery resin is sitting in the vat.

Printer	Build Plate	Min Vat Pour	Class	Notes
Elegoo Mars 3 / 3 Pro	143×90mm	60 mL	Small	Most common starter machine in US market.
Elegoo Mars 4 / Ultra	153×92mm	65 mL	Small	9K screen; slightly larger vat than Mars 3.
Elegoo Mars 5 Ultra	150×84mm	60 mL	Small	18-micron resolution; compact footprint.
Anycubic Photon Mono 2	143×89mm	60 mL	Small	Budget entry-point; wide availability at MicroCenter.
Anycubic Photon Mono 4K	165×102mm	70 mL	Small	Slightly larger build; popular for miniatures.
Elegoo Saturn 3 Ultra	218×123mm	125 mL	Medium	Current mid-size benchmark; ACF film reduces adhesion.
Elegoo Saturn 4 Ultra 16K	220×123mm	125 mL	Medium	Smart heated vat maintains 30°C. Top 2026 pick.
Anycubic Photon M3 Plus	197×122mm	110 mL	Medium	Good mid-size; older lineup but well-supported.
Phrozen Sonic Mighty 8K	200×125mm	110 mL	Medium	8K mono screen; popular in dental/jewelry shops.
Anycubic Photon M3 Max	298×164mm	250 mL	Large	Large-format; significant priming cost per session.
Phrozen Sonic Mega 8K	330×185mm	200 mL	Large	Largest consumer MSLA; industrial-scale minimum pours.

Minimum pour volumes are community-measured estimates based on FEP coverage requirements. Actual values vary slightly by vat wear, FEP tension, and resin viscosity at room temperature.

Hollowing Models to Cut Resin Use by 50 to 80 Percent

The single most impactful technique for reducing resin consumption in miniature, jewelry, and sculptural printing is model hollowing. Instead of printing a solid object, you print a shell: a thin outer wall (typically 1.5 to 2.5mm) surrounding an empty interior. The hollow interior fills with uncured liquid resin during printing, which is then drained through small holes you add to the base or bottom of the model.

The volume savings are dramatic. A solid 30mm figurine (15mm cube equivalent) might have a solid volume of 27 mL. With a 1.5mm shell, the interior cavity measures approximately 27mm x 27mm x 27mm, with a volume of about 19.7 mL. The wall volume (the resin you actually cure) is 27 minus 19.7, or about 7.3 mL. You have cut resin use from 27 mL to 7.3 mL: a 73 percent reduction. At $0.065 per mL for standard Elegoo resin, that is a $1.28 saving on a single piece. Across 50 prints per week in a busy print shop, that is $64 per week in resin savings from hollowing alone.

Hollowing rules: Add drain holes of at least 3mm diameter. Position them where liquid resin can flow out during printing (typically the lowest points on the model relative to the build plate, which is usually the top of the object in standard upside-down MSLA orientation). Two to four drain holes are sufficient for most models. Inadequate drain holes trap uncured resin inside, adding weight and creating suction forces that can cause the supports to fail.

The Hollowing Mode in the Volume Planner above calculates your estimated wall volume based on shell thickness and minimum model dimension. This gives you an accurate material reduction estimate before you hollow the model in Chitubox or Lychee. Enter the smallest dimension of your model (e.g., 22mm for the narrowest cross-section) and your shell thickness to see the percentage reduction and exact mL saved.

Resin Types, Densities, and the Weight vs. Volume Confusion

Most resin is sold by volume: 250mL, 500mL, or 1000mL bottles. Some premium resins are sold by weight (500g bottles), which creates confusion when trying to calculate cost per print from slicer output in mL. The bridge between volume and weight is density, expressed in grams per milliliter (g/mL).

Standard 405nm photopolymer resin has a density of approximately 1.10 g/mL. This means a 500mL bottle weighs about 550 grams of resin (plus the bottle itself). If your print uses 25 mL, it consumes 25 x 1.10 = 27.5 grams of resin. For a resin sold by weight (e.g., a 500g bottle at $45), the cost per gram is $0.09, and your 27.5-gram print costs $2.48 in raw material. The density selector in this calculator handles all these conversions automatically for 10 common resin types.

Resin Type	Density (g/mL)	Typical US Price	Best Applications
Standard 405nm	1.10	$20-35 / 500mL	Miniatures, display models, prototypes
Water-Washable	1.10	$25-40 / 500mL	Home users without IPA; slightly less detail
ABS-Like / Tough	1.15	$30-50 / 500mL	Functional parts, snap-fit components
Engineering Resin	1.18	$55-90 / 500mL	Load-bearing prototypes, engineering fits
Dental Resin	1.19	$80-150 / 500mL	Dental models, orthodontics, prosthetics
Flexible / Elastic	1.08	$40-65 / 500mL	Gaskets, phone cases, anatomical models
Castable (Jewelry)	1.12	$60-100 / 500mL	Investment casting masters, ring blanks
High-Speed / Rapid	1.10	$30-50 / 500mL	Production runs where speed beats detail
Formlabs Standard	1.12	$149-299 / 1L	Formlabs Form printers; proprietary cartridge

Three Real US Print Scenarios Where Accurate Volume Planning Saves Real Money

Los Angeles, California: Miniature Painter Batch Printing for a Subscription Box

An LA-based maker prints 28mm fantasy miniatures for a monthly subscription box, running an Elegoo Saturn 3 Ultra. Each plate holds 24 miniatures. The slicer reports 4.2 mL per figure plus light supports (10%), bringing each piece to approximately 4.62 mL. Batch total: 24 x 4.62 = 110.9 mL. Add 10% safety buffer: 122 mL. The Saturn 3 minimum pour is 125 mL. So the pour recommendation is 125+ mL, as the vat priming requirement actually exceeds the print volume on this batch. Without the Volume Planner, the maker would pour “about 120 mL” and risk the Saturn 3’s FEP drying on the far edges of its 218mm build plate, potentially causing adhesion failure on edge miniatures. The calculator flagged this exact scenario.

New York City, New York: Jewelry Master Pattern Production

A NYC jewelry designer prints hollow wax-castable resin master patterns for a platinum ring line. Each ring blank has a solid slicer volume of 8.4 mL. Hollowing to 1.5mm shell reduces the effective volume to approximately 2.8 mL per ring (67% reduction). On an Elegoo Mars 5 Ultra plate, 14 rings fit. Total print volume: 14 x 2.8 = 39.2 mL. Add 10% buffer: 43.1 mL. Minimum pour: 60 mL (Mars 5). Pour 65 mL. Castable resin at $85 per 500mL costs $0.17 per mL. The hollowed prints save 14 x (8.4 – 2.8) x $0.17 = $13.30 per plate. At 4 plates per week, hollowing saves $53.20 per week and roughly $2,765 per year in resin cost. These numbers come directly from the hollowing calculator on this page.

Austin, Texas: Dental Lab Running Multiple Elegoo Saturn 4 Machines

An Austin dental lab runs three Elegoo Saturn 4 Ultra 16K printers producing dental model bases and aligner trays. Each model base uses 28 mL at medium support density (20%), making it 33.6 mL per piece. They print 6 per plate. Vat calculation: 6 x 33.6 = 201.6 mL + 10% buffer = 221.8 mL. Minimum pour for Saturn 4: 125 mL. Pour recommendation: 230 mL. Dental resin at $120/500mL costs $0.24/mL. Each full plate costs $0.24 x 221.8 = $53.23 in raw resin. Three plates per day across three printers: $479.07 per day in resin. The Cost Calculator helps the lab manager validate monthly resin purchasing and identify whether switching to a lower-cost ABS-like engineering resin ($55/500mL) for non-diagnostic models saves $260 per day in material cost without compromising dimensional accuracy.

Six Safety and Efficiency Tips for US Resin Printer Operators

Ventilate Every Print Session Without Exception

The EPA identifies resin printing VOCs including acrylate monomers as respiratory irritants. These compounds peak when the build plate rises from the resin at the end of each layer. Print in a room with active ventilation: open windows, a fan exhausting air outward, or a carbon filter enclosure. Never print resin in an enclosed basement or closet without airflow.

Filter Resin Back Into the Bottle After Every Session

Use paint strainer bags (100 to 190 micron) or fine mesh resin filters to return leftover vat resin to its opaque bottle immediately after printing. Resin left in an open or lightly covered vat will partial-cure from ambient UV within 24 to 72 hours, creating cloudy or gelled resin that clogs your vat and ruins subsequent prints.

Warm Cold Resin Before Pouring in Winter

Resin viscosity increases significantly below 60°F (15°C). Cold resin flows slowly, fills narrow support contact points poorly, and increases FEP suction during peel, raising the risk of support failure. Warm the sealed resin bottle in a warm water bath (not hot) to 70 to 80°F before pouring. The Elegoo Saturn 4 Ultra 16K’s built-in vat heater (30°C) automates this for cold-room print farms.

Replace FEP Film on Schedule, Not Just When It Fails

FEP film that has been scratched, clouded, or stressed allows less UV light through, increasing exposure times needed and causing layer adhesion issues. Replace FEP every 50 to 80 prints for small printers or every 30 to 50 prints for large-format machines where FEP tension is higher. At $10 to $25 per film, this is far cheaper than a failed plate of dental models or jewelry masters. The Cost Calculator accounts for FEP amortization per print.

Add Drain Holes Before Hollowing, Not After

In Chitubox and Lychee, the workflow is: hollow the model first, then add drain holes. If you hollow and then forget drain holes, you will get a print with liquid resin sealed inside. This creates two problems: extra weight (deceptively heavier than expected) and potential pressure-induced cracking during post-cure as the trapped resin heats up. Add two to four drain holes of at least 3mm diameter to every hollowed model before slicing.

Track Cost Per Milliliter, Not Per Bottle

Resin pricing is confusing because bottles come in 250mL, 500mL, and 1000mL sizes with very different price-per-mL rates. A $25 Elegoo 500mL bottle costs $0.05/mL. A $65 Siraya Tech engineering 500mL bottle costs $0.13/mL. A $149 Formlabs 1000mL cartridge costs $0.149/mL. Calculate cost per mL for every resin you use and enter it into the Cost Calculator for accurate per-print cost tracking regardless of bottle size.

Quick Reference: Resin Consumption by Print Scenario at 2026 US Prices

All volumes include 10% support overhead (light support density) and 10% safety buffer. Does not include vat priming minimum. Add your printer’s minimum pour on top when planning the total pour.

Print Scenario	Solid Vol	Total w/Buffer	Standard Resin Cost	Engineering Resin Cost
Tiny keychain figure (25mm)	2.5 mL	3.0 mL	$0.15	$0.39
28mm miniature (solid)	4.5 mL	5.4 mL	$0.27	$0.70
28mm miniature (hollowed 1.5mm)	1.4 mL	1.7 mL	$0.09	$0.22
Ring band, solid	3.2 mL	3.8 mL	$0.19	$0.49
Dental arch model (solid)	22 mL	26.4 mL	$1.32	$3.43
Full plate: 24x miniatures (hollowed)	33.6 mL	40.3 mL	$2.02	$5.24
Full plate: 24x miniatures (solid)	108 mL	129.6 mL	$6.48	$16.85
Large prop head (80mm, hollow)	38 mL	45.6 mL	$2.28	$5.93

Standard resin at $0.05/mL (Elegoo 500mL ~$25). Engineering resin at $0.13/mL (Siraya Tech 500mL ~$65). Vat priming minimum not included; add printer-specific minimum pour from the table above.

16 Frequently Asked Questions About Resin Volume and Cost Calculation

How much resin does a typical 28mm miniature use?+

A solid 28mm scale tabletop gaming miniature typically uses 3.5 to 5.5 mL of resin depending on pose complexity, basing, and weapon size. With light supports at 10% overhead and a 10% safety buffer, plan for 4.2 to 6.6 mL per figure. Hollowing to a 1.5mm shell reduces this to 1.2 to 2.0 mL for the wall material, though the hollow interior fills with uncured resin during printing which you drain and recover. At standard resin pricing around $0.05 per mL, a solid miniature costs about $0.25 to $0.33 in raw resin, or $0.08 to $0.12 if hollowed. Slicers like Chitubox and Lychee show the precise slicer volume after hollowing so you can enter the exact number into the Volume Planner above.

What is the minimum resin pour for an Elegoo Saturn printer?+

The Elegoo Saturn 3 Ultra and Saturn 4 Ultra require approximately 125 mL minimum to fully cover the FEP film across their 218-220mm x 123mm build plates. This minimum pour is required before any printing begins, regardless of how small your print is. If you pour less, the FEP at the edges of the build plate will not have sufficient resin coverage, which can cause the first layers to fail to adhere on wide or edge-positioned models. The Volume Planner on this page auto-fills the minimum pour when you select the Saturn 3 or Saturn 4 preset, and adds it to your pour recommendation.

How do I convert resin mL to grams for purchasing?+

Multiply the volume in mL by the resin’s density in g/mL. Standard photopolymer resin has a density of approximately 1.10 g/mL. So 25 mL of standard resin weighs about 27.5 grams. Engineering resin at 1.18 g/mL: 25 mL weighs 29.5 grams. For purchasing, most resin is sold by volume (250mL, 500mL, 1000mL) so you typically buy by mL. If your resin is sold by weight (some premium brands), divide the bottle weight in grams by the density to get the volume in mL. The resin type selector in this calculator handles all conversions automatically and shows both mL and grams in the results.

Why does my print use more resin than the slicer predicted?+

Several factors cause real consumption to exceed slicer estimates: vat priming volume (not counted by slicer), resin that clings to the build plate and model during removal, resin absorbed and released by the FEP during peeling motion, over-exposure in bottom layers (elephant’s foot adds material), and any rafts or custom brims not counted accurately. These losses typically add 8 to 15 percent to the slicer estimate. The 10% safety buffer default in this calculator covers most of these losses. For prints with extensive raft areas or very thin supports, increase the buffer to 15 to 20 percent.

How do I hollow a model in Chitubox or Lychee Slicer?+

In Chitubox Free or Pro: import your model, click “Hollow” in the support preparation panel, set wall thickness (1.5 to 2mm), and confirm. Then use the “Hole” tool to add drain holes (minimum 3mm diameter) at the lowest points of the model orientation. Slice to see the new volume. In Lychee Slicer: use the “Edit” menu, select “Shell,” set thickness, then add escape holes with the hole tool. The hollowed volume shown in the slicer is what you enter into the Volume Planner on this page. Hollowing is especially valuable for large solid models: anything above 10 mL solid volume is a candidate for hollowing. Below 5 mL, the shell wall relative to total size makes hollowing less effective.

How long does resin last in the vat between sessions?+

In a properly covered vat (FEP lid, opaque cover, or original vat cap if available) stored away from UV light sources, most standard resins remain printable for 24 to 72 hours. Longer exposure to ambient UV through window glass, LED room lighting, or sunlight will begin partial curing at the resin surface. If you plan to leave the printer idle for more than 2 days, filter the resin back into its original bottle. When you return for your next print session, pour fresh resin and briefly mix it. Do not try to print from aged, partially-cured vat resin as it will produce cloudy, layered prints and can permanently foul the FEP film.

What does FEP film wear cost per print?+

A replacement FEP film for a small-format printer (Mars class) costs $8 to $20 depending on brand and quality. For a medium-format Saturn or M3 Plus, FEP costs $15 to $30. FEP typically lasts 50 to 80 prints on a small machine and 30 to 60 prints on a large-format machine where peel forces are higher. Dividing the FEP cost by its lifespan gives the per-print wear cost. For a $15 film lasting 60 prints: $0.25 per print. For a $25 film lasting 40 large-format prints: $0.625 per print. The Cost Calculator on this page accepts your FEP cost and expected lifespan and computes the wear amortization automatically.

How does resin 3D printing electricity cost compare to FDM?+

Resin MSLA printers use significantly less electricity than FDM printers. An Elegoo Mars 3 draws approximately 50 watts during printing. A Saturn 3 draws about 70 watts. There is no heated bed (the biggest power draw in FDM), and the UV LED array is highly efficient per watt of UV output. At the US average electricity rate of $0.1844/kWh (EIA 2026), a 3-hour Mars 3 print uses 0.15 kWh and costs about $0.028. Compare this to an Ender 3 V3 running at 120W for 3 hours (0.36 kWh, $0.066). Electricity is even less of a cost factor in resin printing than it is in FDM, which is already a small fraction of total cost. Resin cost dominates almost completely in MSLA economics. See also our 3D Print Cost Calculator for FDM electricity cost comparison.

What support density should I use for miniatures vs functional parts?+

For miniatures with slender features (weapons, flowing fabric, hair), use medium to heavy support (20 to 35%) because the small contact areas need dense support for fine detail. For functional engineering parts with large flat surfaces and rounded geometries, light supports (10%) are often sufficient since the geometry is self-supporting. For jewelry master patterns, especially thin ring bands, use medium to heavy support to prevent flexion during peeling, even though it increases the resin consumption estimate. The support percentage you select should match the support density profile you set in your slicer for the same model.

Can I use this for SLA resin printers like Formlabs Form 4?+

Yes. SLA (laser-based, like Formlabs Form series) uses the same volume-based resin calculation as MSLA (LED array, like Elegoo and Anycubic). The slicer volume in mL is the key input regardless of cure technology. For Formlabs printers, the resin is in a sealed cartridge so you do not manually pour into a vat, but the volume consumed per print is still the sum of the model, supports, and raft. Formlabs’ PreForm slicer reports the estimated volume in mL. Enter this into the Volume Planner and select Formlabs Standard (density 1.12 g/mL) for an accurate weight estimate. Note that Formlabs resin costs significantly more per mL ($0.15 to $0.30) than open-market 405nm resins, which the Cost Calculator will make very visible in the cost breakdown.

Why is hollow printing not recommended for very small objects?+

Hollowing becomes ineffective and structurally risky when the object’s smallest dimension is less than about 15 to 20mm. With a 1.5mm shell on a 10mm object, the interior cavity measures only 7mm across (10 – 2×1.5), giving a volume of about 34% of the solid. The volume savings are modest and the structural integrity of such a thin shell on a small object is poor. Hollow printing for small objects also requires placing drain holes that are proportionally very large relative to the object, which can damage the visible surface. Below 10mm, solid printing is recommended. Above 20mm, hollowing is almost always worthwhile on a per-mL-savings basis.

How accurate are the minimum pour estimates for each printer?+

The minimum pour values in this calculator are community-measured estimates based on the FEP coverage area for each printer’s build plate, typically accurate within 10 to 15 mL. The exact minimum for your specific printer and vat will vary based on how your FEP is tensioned (tighter tension requires slightly more resin to fill the vat floor), whether you use ACF or nFEP film (which affects the meniscus), and the viscosity of your specific resin at your shop’s ambient temperature. Always add your 10% safety buffer on top of the minimum pour to account for these variables. If you find your prints are failing on edge positions, increase the pour by 10 to 15 mL until adhesion is consistent across the full build plate.

What is the IPA wash cost per print?+

IPA wash cost per print depends on your washing method and solution refresh rate. For manual bucket washing with 99% isopropyl alcohol, a typical setup uses 500mL to 1L of IPA per print session. At $8 to $12 for a 32oz bottle of 99% IPA (available at hardware stores, pharmacy chains, or Amazon), the per-session wash cost is $0.25 to $0.75 depending on how many prints per session and how frequently you refresh the IPA. The Cost Calculator default of $0.50 per session is a reasonable starting point. For wash-and-cure station users running Elegoo Mercury or Anycubic Wash and Cure, refresh your IPA solution when it becomes visibly cloudy or brownish, typically every 15 to 30 large-plate print sessions.

How do I use this calculator for batch plate planning?+

Enter the volume for a single piece (from your slicer) in the Volume Planner, set your support percentage, and then enter the number of pieces on your plate in the “Pieces on Plate” field. The calculator multiplies model plus support volume by piece count, adds the safety buffer, and then compares the result to your printer’s minimum pour, taking whichever is larger as your actual pour. For example: 24 miniatures at 4.2 mL each (with 10% support = 4.62 mL each), batch total = 110.9 mL. Add 10% buffer: 122 mL. Saturn 3 minimum pour: 125 mL. Pour recommendation: 130 to 135 mL. This workflow prevents the common mistake of pouring only the print volume and finding the vat edge is dry.

What resin should I use for outdoor functional parts?+

Standard and even ABS-like photopolymer resins are susceptible to UV degradation outdoors. Prolonged sunlight exposure causes yellowing, brittleness, and delamination within weeks to months. For outdoor functional parts, use resins with built-in UV stabilizers (labeled “UV resistant” or “weatherproof” by brands like Siraya Tech, Monocure, or Photocentric), or post-paint the part with UV-blocking clear coat. Alternatively, consider FDM printing in ASA filament for outdoor applications, which has vastly superior UV resistance compared to any photopolymer resin. The 3D Print Cost Calculator can help you compare the cost difference between resin and FDM for functional outdoor parts to inform your material choice.

How do I dispose of uncured liquid resin safely in the US?+

Uncured liquid resin is a hazardous chemical that must not be poured down drains or into household garbage in the US. The correct disposal method is UV curing before disposal: spread the uncured liquid resin in a thin layer in a disposable container and leave it in direct sunlight for several hours until fully hardened. Cured solid resin can then be disposed of in regular household garbage in most US jurisdictions. Alternatively, many US municipalities accept uncured resin at household hazardous waste (HHW) collection events. Check earth911.com or contact your local county solid waste department for HHW drop-off sites in your area. Used IPA wash solution containing dissolved resin should be treated the same way: UV-cure the resin solids out of the liquid before disposal, and consult your local HHW program for the remaining IPA.

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Legal Disclaimer and Editorial Transparency

This calculator is provided for informational and planning purposes only. Volume and cost estimates depend entirely on the accuracy of user-provided inputs including slicer volume, support density, and safety buffer settings. Real resin consumption will vary based on print geometry, slicer settings, FEP film condition, ambient temperature, and resin batch variation.

Printer vat minimum pour volumes are community-measured estimates. Resin density values are sourced from manufacturer technical data sheets. Electricity rates reflect EIA Electric Power Monthly 2026 data. All health and safety references relating to 3D printer emissions are sourced from U.S. EPA 3D Printing Research.

USCalculators.com is an independent resource not affiliated with Elegoo, Anycubic, Phrozen, Formlabs, or any resin or printer manufacturer. No content on this page constitutes safety guidance replacing proper training, nor engineering advice for critical applications. Always follow your printer manufacturer’s safety guidelines and local regulations for handling and disposing of photopolymer resin. Content last reviewed: 2026. For corrections, contact our editorial team.