What a print costs you
The filament is the grams your slicer reports for the whole print, supports and purge included, times the price of a spool over the grams on it. A 120 g print from a $20 spool of 1,000 g uses $2.40 of filament. A filament tracker keeps that figure for every print and takes the grams off the spool they came from.
Power is the printer’s average draw in watts, times the print time, divided by 1,000 and multiplied by your price for a kilowatt hour. A plug-in power meter shows the draw. An eight-hour print at 200 W and $0.12 a kilowatt hour uses about $0.19 of power.
Machine wear is the share of the printer’s life that a print uses. Divide what the printer cost by the hours you expect from it, then add what you spend on nozzles, plates and belts over that time.
Your time covers slicing, removing supports, cleaning the part and packing it. In the example in the boxes, 15 minutes at $20 an hour is the largest line of the cost.
The price after fees
A marketplace takes a share of the sale and often a fixed amount on top. If you only add the fees to your cost, the share is taken from the fees too and your margin shrinks. The calculator works back from what you want to keep: it divides your cost plus markup, plus the fixed fee, by what is left after the share.
With the example in the boxes, the print costs $10.01 and a 50% markup makes $15.01. With a fee of 9.5% and $0.45 a sale, the price becomes $17.08, and the $5.00 profit stays the same.
Fees on Etsy
In the United States, Etsy charges $0.20 to list an item, a 6.5% transaction fee on the order total with shipping, and 3% plus $0.25 for payment processing. The shipping you charge pays fees as well, so a high shipping price raises them. A sale in person has none of this: leave the two fee boxes at 0.
Sharing a quote
Share these numbers sends a link that opens the calculator with your boxes filled in, which is handy when a customer or a partner wants to see how you got to the price.