How to Calculate the Cost of a 3D Print
Material, energy, machine depreciation, maintenance, failures, and labor: every cost layer of a 3D print, measured and totaled.
By OrcaCostPrint Team · Published
The most common shortcut is "grams × price per kilogram." It answers how much the plastic cost — and nothing else. For a 45 g PLA piece at $20/kg, that's $0.90. If your price came only from that, you're selling the filament and giving away everything else for free.
The rest isn't small: the printer wears down, energy is metered, the time you spend prepping, removing, and sanding is work, and some prints fail. This page shows how to measure each layer. Cost is what you spend to produce the piece; the selling price is a separate step.
Material
Use the grams actually consumed: piece + supports + purge (on multicolor printers, purge can weigh more than the piece itself). Your slicer shows this number before you print.
Use the price of the spool you actually bought, shipping included — not the price from the sale you saw online. A 1 kg spool at $20 costs $0.02 per gram.
Print time
Time isn't a cost by itself, but it's the base for almost everything that isn't plastic: energy, machine, and maintenance are all charged per hour. Use the time your slicer estimates, and adjust if your printer usually takes longer.
Electricity
Average power draw × hours × your rate per kWh. Average draw is well below what the power supply is rated for: the heated bed pulls a lot at the start and much less after. A cheap plug-in power meter gives you your machine's real number.
Example: 150 W for 9 hours at $0.16/kWh = 1.35 kWh × $0.16 ≈ $0.22. Small per piece, noticeable by the end of the month. Use the rate from your actual electric bill, taxes included.
Machine cost and depreciation
The printer is an asset that wears out. A simple way to estimate how much of the machine belongs in your cost is to divide the money you invested by the productive hours you expect to get out of it before replacing it — a practical estimate, not an accounting rule:
$800 ÷ 4,000 hours = $0.20 per hour of printing
This is the layer almost nobody charges for — and it's the one that pays for your next printer. Without it, when the machine dies, the money to replace it just isn't there.
Maintenance
Nozzle, belts, bed, PTFE tubing, lubrication: wear tracks the hours printed. Add up what you spend on replacement parts in a year and divide by the hours printed in that same period. If you don't have history yet, set aside a per-hour reserve and adjust later.
Failures and waste
Every operation has prints that go wrong: it lifted off the bed, the nozzle clogged, the power went out. If your success rate is 90%, the expected cost per sellable piece is the cost of one attempt divided by 0.90 — about 11% more, not 10%. Track your failures for a month: the real number tends to surprise you.
Labor
Prepping the file, leveling the bed, removing the piece, taking off supports, sanding, packaging. Time a typical piece start to finish and multiply by what your hour is worth. Work you don't charge for is work you pay for.
Adding it all up
| Layer | How to calculate |
|---|---|
| Material | grams × price per gram |
| Energy | average power × hours × rate |
| Machine | (price ÷ useful hours) × hours |
| Maintenance | per-hour reserve × hours |
| Failures | production cost ÷ success rate |
| Labor | minutes worked × hourly rate |
The sum is the piece's cost. It's not the price yet: margin and selling fees are still missing — the next step is in how much to charge for 3D printing.
Cost isn't price
Knowing how to separate the two is what lets you negotiate without losing money: you know exactly how far you can go before you're working for free. More on this in 3D printing pricing.
The 3D printing cost calculator gives you a quick estimate of material, energy and margin instantly, no sign-up required. The full math — machine, maintenance, failures, and labor — lives in OrcaCostPrint's advanced calculator.