How do I calculate resin cost per print?
- Convert the bottle to milliliters: grams ÷ density (g/ml).
- Price per ml = bottle price ÷ bottle ml.
- Multiply by the ml your slicer reports, plus a waste allowance for resin lost in the vat and on parts.
- Add consumables: IPA or wash liquid, gloves, towels, and a share of release film (FEP/nFEP) and screen replacement.
Why is a 1 kg bottle not 1,000 ml?
Most resins are denser than water, so 1 kg fills less than a liter. The exact density is on the bottle or the manufacturer’s datasheet; standard resins commonly fall around 1.05–1.2 g/ml. Using the right density keeps the cost per ml accurate.
Is resin printing more expensive than filament?
Per gram of finished part, usually yes — resin costs more per kilogram and needs consumables like IPA and gloves. But small, detailed parts use very little resin. Compare a part both ways with the FDM print cost calculator.
Frequently asked questions
How much resin does a print use?
Your slicer reports the volume in ml after you add supports. Hollowing a model and adding drain holes can cut resin use dramatically for larger parts.
How much resin is wasted?
Some resin stays on parts and supports and is washed off, and some remains on the vat and build plate. Many users allow around 5–15%; track a few prints to find your own figure.
How often should I replace the release film?
It depends on use and care. Spread the cost of a film or screen over the number of prints it typically lasts you to get a per-print figure.
Sources
Estimates for planning. Results depend on the numbers you enter — use the gram, hour and ml figures from your slicer, and your real material and power prices. Material densities are typical values; check your spool or bottle datasheet for exact figures.