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Why resin printing costs surprise people
Resin printing feels cheap per print until you add up the bottle. A litre of standard resin costs far more than a kilogram of filament, and every print drinks from that bottle in ways that are easy to underestimate. The model itself is only part of the story: supports, rafts, and the resin that clings to the build plate and the finished part all come out of the same bottle. This calculator gives you the honest starting figure, model volume plus a support allowance, converted into millilitres and money, so the cost of each print stops being a surprise.
The math is simple. Resin volume in millilitres equals model volume in cubic centimetres multiplied by one plus the support allowance. A 30 cubic centimetre model with a twenty percent support allowance needs 36 millilitres. At forty dollars per litre, that is one dollar and forty-four cents of resin. The calculator also estimates cured weight at about 1.10 grams per millilitre, which is useful when a part must stay under a weight limit, for example for a drone or a wearable piece.
Finding model volume and choosing a support allowance
Your slicer reports the model volume, and most resin slicers also report the estimated resin use including supports, which is the number to compare against this calculator. If the slicer estimate is much higher than the calculator, your support allowance is too low, or the model has hollow sections that trap resin. If it is much lower, your allowance is generous, which is the safer direction for budgeting. A twenty percent allowance suits a well-supported model with light supports. Heavy supports, thick rafts, or models with large flat overhangs can push the allowance to forty percent or more.
Hollow models deserve special attention. A hollow model uses far less resin than a solid one, but only if it has drain holes, so uncured resin can escape. Without drain holes, the hollow interior stays full of liquid resin, and the print weighs and costs as much as a solid one, while also risking cracks later as trapped resin cures and expands. Always add drain holes to hollow resin prints, and position them so resin can actually flow out during and after printing.
A worked example
Suppose you print a figurine with a volume of 45 cubic centimetres, using medium supports at a thirty percent allowance, from resin costing fifty dollars per litre. The resin needed is 45 times 1.30, which is 58.5 millilitres, costing two dollars and ninety-three cents. The cured weight is about 64 grams. Now print the same figurine hollow with 2 mm walls and drain holes, bringing the solid volume down to 12 cubic centimetres. With the same support allowance, resin drops to 15.6 millilitres and cost to seventy-eight cents. Hollowing is the single biggest cost saving in resin printing, when the design allows it.
Consider also the hidden costs. Resin that stays on the build plate, in the vat after a failed print, or in the wash container is real consumption that no calculator counts. Failed prints are the biggest hidden cost of all: a print that fails at ninety percent wastes nearly the full resin volume. Budgeting a margin above the calculator figure, and protecting it by printing a small test before a large model, is cheaper than pretending failures do not happen.
Reducing resin use without ruining prints
Orientation is the cheapest lever. Tilting a model at an angle reduces the cross-section of each layer, which reduces peel forces and often reduces support volume at the same time. Light supports use less resin than heavy supports, but they fail more easily on large models, so match support weight to model size rather than defaulting to the lightest setting. Hollowing with sensible wall thickness, usually 1.5 to 2.5 mm for display pieces, saves more resin than any support tweak.
Do not hollow functional parts that take load without thinking about strength. A hollow part with thin walls can crack under stress that a solid part would survive. For load-bearing resin parts, keep walls thicker or keep the part solid, and accept the resin cost as the price of strength. For display pieces, hollowing is almost always the right call.
Frequently asked questions
Why does my printer use more resin than calculated? Supports, rafts, failed layers, and resin left on the plate all add use. The calculator counts model plus a support allowance only, so treat it as a floor, not a ceiling.
Can I reuse resin from the vat? Yes, filtered and returned to the bottle, but never mix resin types, and filter out cured bits or they will ruin the next print.
Is resin cost per print really that important? For one small print, no. For a shop printing daily, the difference between one and three dollars per print is thousands per year.
These figures are estimates and general guidance only, not a guaranteed print result. Your resin manufacturer’s datasheet and your printer’s own calibration govern every setting. Handle resin only with ventilation and gloves, exactly as the resin maker’s safety sheet requires. Use the calculator above to price each print before you start it.
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