What does a print really cost?
Most people count filament and stop. That's about half the story. Your printer uses electricity, wears out over time, and sometimes a print fails and the filament goes in the bin. Leave those out and you'll underprice anything you sell.
The calculator adds them all up: material, power, machine depreciation and a failure buffer. If you sell prints, it also adds your markup and gives a sale price.
The cost parts
Material cost is the weight of filament used times the price per gram. Get the weight from your slicer. Spool price divided by spool weight gives the per-gram price.
Electricity depends on printer wattage, print time and your local rate. A typical hobby printer draws less than you'd expect once it's at temperature, so enter a realistic average and not the peak figure on the label.
Depreciation spreads the printer's price over its working life. If a $400 machine lasts about 4,000 hours, that's ten cents per hour. Add a little for nozzles and belts.
Why include failure rate
Prints fail. Spaghetti, bed adhesion, a clog at hour six. If one in ten prints goes wrong, you've paid for ten and sold nine. A failure buffer of a few percent spreads that cost over everything you sell. Be honest about your own number, and watch it drop as your printer gets tuned.
Resin printers
The method works for resin as well. Enter resin weight and cost per gram in place of filament, and add the cost of isopropyl alcohol, gloves and wash time as extra costs. Resin tends to cost more per gram and needs more cleanup labor.
Setting a sale price
Markup is where profit lives. A common starting point for a print service is two to three times the raw cost, because you also pay for your time, design work, packaging, platform fees and support. Check what similar sellers charge and see if the numbers work.
Don't forget labor. Post-processing, sanding and painting can take longer than the print itself. If you count your time at zero, you're working for free.
Quantity and sensitivity
Per-unit cost drops a little for batches, since setup and failure risk spread across more pieces, but the material and power costs stay linear. A sensitivity view shows how changes in filament price or print time shift the total, so you can spot what matters most.
A pie chart breaks down where the money goes. For many prints, material is the largest slice. For long prints on a power-hungry machine, power and wear grow.
The calculation runs in your browser and your numbers aren't stored.