Estimating Resin Usage and Cost for Dental Prints

The resin in the model itself is only part of what a print consumes; supports, rinse losses and failed prints decide what a dental part really costs.

Updated 20 October 2026 · 6 min read

Resin printers have made in-house production of models, splints and guides routine for dental labs and practices. Pricing those parts, or just knowing when to reorder, requires a realistic estimate of how much resin each job uses. The slicer's volume figure is a starting point, but it rarely matches the drop in the bottle. This guide breaks down where resin goes, gives typical volumes for common dental parts, and shows how to calculate a cost per part you can trust.

Where the resin goes

Total consumption for a print has four components:

1. Part volume. The cured volume of the object itself. This is what an STL volume calculator reports from the mesh.
2. Supports and raft. For dental parts printed at an angle, supports often add 10–40% to the part volume. Small parts like crowns can have supports that weigh as much as the crown.
3. Process loss. Uncured resin that clings to the part and build plate and ends up in the wash, plus residue left in the vat that degrades or gets filtered out. Typically 5–15% depending on part geometry and how long you let parts drip.
4. Failures and reprints. A failed plate of models can consume as much resin as a successful one. Even a 3–5% failure rate is worth including in cost calculations.

Your slicer (ChituBox, Lychee, PreForm, or a manufacturer's own software) usually reports the volume of part plus supports. Treat that as the minimum, then add process loss and a failure allowance.

Solid, hollow and horseshoe models

Dental models are the largest resin consumers in most workflows, and the design choice makes a large difference.

Solid models with a base

A traditional full-arch model with a flat base is the heaviest option. Depending on base height and arch size, it can use several times more resin than a hollowed version. Solid models are still common when the model must be very rigid, for example for articulator mounting.

Hollow models

Hollowing keeps the outer surface and replaces the inside with a shell, usually 1.5–3 mm thick. This cuts resin use substantially. Two things matter:

• Drain holes. A hollow model printed with its open base facing away from the plate, or a fully closed hollow shell, traps liquid resin. Trapped resin can crack the model later, and closed cavities create suction during each layer peel. Add at least two holes, typically 2–4 mm in diameter, placed so resin can drain and air can enter.
• Wall thickness and use. Models for thermoforming aligners and retainers must withstand heat and pressure. Very thin shells can deform; many labs keep walls at 2 mm or more for these and print with an open, flat base.

Horseshoe (base-less) models

Horseshoe models remove the palate and the solid base, leaving only the arch with a shallow plinth. They are popular for aligner and retainer work because they use little resin, print quickly, and can often be printed flat on the build plate in larger numbers. Their lower rigidity means they are less suited to cases where cross-arch accuracy is critical.

Typical resin volumes for dental parts

The figures below are approximate ranges for parts plus supports, assuming common designs. Actual values vary with the anatomy, design software settings and orientation, so measure your own files to build a reference table for your lab.

To get exact numbers for a specific file, load the STL and read the volume directly. The resin calculator turns that volume into a material cost once you enter your bottle price.

Calculating cost per part

A practical formula:

Resin cost = (part volume + support volume) × (1 + process loss) × (1 + failure rate) × price per ml

Price per ml is the bottle price divided by its volume. If your resin is sold by weight, divide by density: most dental resins are roughly 1.1 g/ml, but check the manufacturer's data sheet, because highly filled resins can be denser.

Resin is rarely the only cost. For a complete per-part figure, add:

• Wash and cure consumables: IPA or other wash solvent, replaced after a certain number of plates, plus gloves and paper towels.
• Wear parts: vat film (FEP/nFEP/ACF) and, on MSLA machines, the LCD screen, which has a limited lifetime. Divide replacement cost by the expected number of prints.
• Machine and labour time: printer depreciation and the time spent on preparation, support removal and finishing. For dental work, labour often outweighs material.

The 3D print cost calculator combines material, machine time and extra costs if you want a single number per job.

Worked examples

Example 1: aligner models

A lab prints 10 horseshoe models per plate for aligner thermoforming. Each model measures 7 ml including a minimal support/raft. Model resin costs €90 per litre, so €0.09 per ml.

• Part and supports: 10 × 7 ml = 70 ml
• Process loss 10%: 70 × 1.10 = 77 ml
• Failure allowance 3%: 77 × 1.03 ≈ 79.3 ml
• Resin cost per plate: 79.3 × €0.09 ≈ €7.14, or about €0.71 per model

Switching the same cases to solid models with a base at around 28 ml each would raise resin cost to roughly €2.85 per model, four times as much, before accounting for longer print times.

Example 2: occlusal splint

A splint measures 6 ml, supports add 2 ml. Biocompatible splint resin costs €320 per litre (€0.32 per ml).

• 8 ml × 1.08 (process loss) × 1.05 (failure allowance) ≈ 9.07 ml
• Resin cost: 9.07 × €0.32 ≈ €2.90

Here the expensive material makes orientation and support density worth optimising: cutting supports from 2 ml to 1 ml saves about €0.36 per splint.

Example 3: temporary crowns

A plate of 12 temporary crowns, each 0.25 ml with 0.35 ml of supports, in a crown resin at €0.40 per ml.

• 12 × 0.6 ml = 7.2 ml
• × 1.10 × 1.05 ≈ 8.3 ml
• Resin cost: 8.3 × €0.40 ≈ €3.33 per plate, or about €0.28 per crown

For small parts like these, supports are more than half of the material. Labour and finishing dominate the real cost.

Reducing resin waste

• Hollow or use horseshoe designs wherever the clinical use allows, and always add drain holes to hollow parts.
• Fill the plate. Printing one model and printing ten take nearly the same machine time on MSLA and DLP printers, because each layer is exposed all at once. Batching reduces per-part machine cost.
• Tune supports. Use light supports on non-critical surfaces and heavier ones only where needed. Many dental slicers include presets for each indication; check whether they over-support for your printer.
• Let parts drip. Tilt the build plate over the vat for a few minutes after printing so excess resin flows back instead of into the wash.
• Filter and reuse vat resin according to the manufacturer's guidance. Mixing old and new resin is acceptable for some materials; for biocompatible resins, follow the validated workflow exactly.
• Track failures. Log failed plates and their cause. A failure rate that falls from 8% to 2% saves more than most support tweaks.
• Store resin properly. Keep bottles closed, away from light and within the recommended temperature range, so material does not expire before use.

Building your own reference table

The most accurate cost data comes from your own lab. For a month, record the slicer volume, the actual resin removed from the bottle, and the number of parts per job. After a few dozen jobs, you will know your real process loss and failure rate for each indication, and can price new cases from the STL volume alone with confidence.