Should I enter the solid or the hollowed volume?

The hollowed volume — that is the resin that actually becomes the part. If your slicer reports the solid volume, hollow the model first and re-check; the difference is usually 60–80% of the resin cost.

What support percentage should I use?

10–25% of model volume for typical miniatures and mechanical parts. Thin, tall or heavily overhanging models can exceed that. If you always slice with the same support settings, measure one print by weighing the cured result and the supports separately, then use that ratio.

Why include consumables separately from resin?

Because IPA, gloves and FEP film are real cash but are not resin — mixing them into a per-millilitre resin price hides them. Put your per-print consumable spend in its own field.

Does this work with water-washable resin?

Yes. Choose “Standard resin” and put your actual price per kg in the resin price field. The wash liquid is a consumable, so add it to the consumables field.

Resin

Resin cost calculator

Resin is billed by the millilitre that leaves the bottle, not the millilitre in the model. This one counts supports, waste, consumables and failures.

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Model volume (ml)

1 ml = 1 cm³. Your slicer reports this; for a hollowed model use the hollowed volume.

Resin

Supports (% of model)

Supports and rafts. 10–25% is typical; complex models need more.

Waste (% of total)

Resin that stays on the plate, in the vat or on the tools.

Print time (hours)

Consumables per print

IPA, gloves, FEP wear. Not resin — that is item one.

Failure rate (%)

Target margin (%)

Electricity region

Electricity per kWh

Resin price per kg

Currency

Printer cost, life and maintenance

The dataset has no resin printer price, so the machine rate starts at zero — add yours and the machine line stops being free.

Printer cost

Expected life (hours)

Maintenance per hour

Why resin cost is not “price per ml × model volume”

A 30 ml model does not use 30 ml of resin. It uses the 30 ml in the model, plus supports and rafts, plus what stays on the build plate and the tools, plus the print you throw away. On small miniatures the supports can be a third of the total. Getting that wrong is why resin sellers discover their margin disappeared after twenty orders.

Line	Formula
Resin weight	volume_ml × density × (1 + supports%) × (1 + waste%)
Resin cost	weight_g ÷ 1000 × price_per_kg
Electricity	watts ÷ 1000 × hours × price_per_kWh
Machine time	(printer ÷ life_hours + maintenance) × hours
Failures	subtotal × f ÷ (1 − f)
Price	unit cost ÷ (1 − margin)

No measured average power draw is published for the printer in the dataset, so the rated maximum (144 W) is used instead — electricity is then an upper bound, not a guess in the optimistic direction. Even so, electricity is almost never the expensive part of a resin print: the resin and the failure rate are.

Resin cost calculator

Why resin cost is not “price per ml × model volume”

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