Every honest answer to "how much does this print cost" starts with a question back: which printer, which filament, and what settings? A 200-gram part in matte PLA on a small open-frame machine and the same part in nylon on a 350 mm heated-chamber printer are not the same job, and they are not close. The difference is not a rounding error — it can be a factor of four.
That is why this site is built around calculators rather than around one number. The reference pages exist to feed the calculators real figures: densities that come from data sheets rather than a single hard-coded 1.24 g/cm³, wattage figures that say whether they were metered or estimated, and an electricity rate you can set to your own.
The four numbers that make up a print's cost
Most published print-cost figures only count the first one.
- Filament. Grams used multiplied by the price per gram. The trap is density: a matte PLA is 8.9% denser than plain PLA and a glow-in-the-dark grade 12.9% denser, while a metal-filled PLA can be nearly three times denser. A slicer that assumes a generic density under-reports the mass of the spool you actually loaded.
- Electricity. Wattage multiplied by hours multiplied by your rate. Every part of this varies: an A1 mini settles near 65 W while a 420 mm open bed can hold 250 W all print, and household rates across the regions we list span a factor of four.
- Failures. A print that fails at 80% has consumed 80% of the filament, 80% of the electricity and 100% of your attention, and produced nothing. If you sell prints, a failure allowance is not pessimism, it is arithmetic.
- Machine time. Nozzles wear, belts stretch, build plates get replaced, and a printer that cost money has a finite life. Spread over hours, it is small. Ignored entirely, it is the reason a print business quietly loses money.
Where the numbers on this site come from
Densities are the values published on mainstream technical data sheets for each polymer class, stored as ranges where real spools genuinely vary, with the basis of the figure recorded next to it. Shrinkage is stored per material along with whether it is isotropic, because on an FDM part it usually is not — the build plate restrains the base while the layers above contract freely.
Wattage gets the most careful treatment, because it is where published cost figures usually come apart. Rather than one headline number, every machine here carries a small provenance record: what it draws sitting idle, what it settles at mid-print, what it spikes to while the bed climbs, and — the part that matters — where each of those came from. A figure somebody metered and a figure inferred from a similar machine are both useful; presenting them as if they were the same kind of fact is not. The electricity cost method shows what happens to a cost estimate when that distinction is dropped.
Start where your question is
If you want a number, go to the calculators. If you want to know whether a material will survive what you are about to do with it, the materials reference is organised by family and every page ends with what that material is genuinely bad at. If something is going wrong on the plate right now, troubleshooting is organised by symptom and explains the mechanism before it lists a fix, because the mechanism is what lets you diagnose the next failure yourself.
There is no single right answer to what a print costs. There is a right method, and there are your own inputs. This site supplies the first and asks you for the second.
What this site will not do
It will not tell you that a print costs eight cents without asking anything about your setup, and it will not tell you that running a printer costs several dollars an hour because someone quoted a power-supply rating as a consumption figure. Both of those numbers circulate widely, they are wrong in opposite directions, and either one is enough to make a decision badly.
It will also not review printers. Models are replaced faster than any independent site can track, and a review written now is stale in a year. The physics of a polymer cooling on a plate does not change, the arithmetic of electricity does not change, and a method for pricing your own work is still correct after you replace the machine.
The honest limits of any estimate
A slicer estimates mass by multiplying extruded volume by a density figure someone entered, and estimates time from a motion model that does not know your machine's real acceleration limits. Both are optimistic, and the errors compound on long prints. Purge, prime lines, brim and supports are frequently excluded from the headline figure. Failed attempts never appear in it at all.
So the most valuable thing you can do with any calculator, including the ones here, is calibrate it once: print something, weigh it, and note the ratio between the real mass and the estimate. That single number folds in every effect no model captures, and it makes every later estimate on this site substantially more accurate than any published average could be.