3D Print Cost Calculator
Most people price a 3D print by guessing, then wonder why they're losing money on every order. The filament spool was $22, the print took four hours, and somehow the math still doesn't add up at the end of the month. A 3D print calculator fixes that by breaking the job into its real cost components: filament weight, electricity draw, machine wear, and the printer failures that eat into your margin even when you don't talk about them out loud.
This isn't just for people selling prints on Etsy or running a print farm out of a garage. Hobbyists benefit too, if only to understand what a print actually costs before committing a whole evening and a third of a spool to it.
What Actually Goes Into a Print's True Cost
Filament cost is the obvious one. Weigh the model in your slicer (most slicers show this before you even start), multiply by your cost per kilogram, and divide by 1000 to get grams into the right unit. A 60g print using $20/kg filament costs $1.20 in material alone — that part's simple.
Electricity is where people get it wrong. A typical FDM printer draws somewhere between 80 and 250 watts depending on bed size and whether it's heating constantly. Convert watts to kilowatts, multiply by hours run, multiply by your local electricity rate, and you've got the real number. It's usually smaller than people expect, often under a dollar for a standard print, but it adds up across a hundred jobs a month.
Machine Depreciation Nobody Accounts For
Your printer isn't free to run even when the electricity bill is small. It cost money, it has a lifespan, and parts wear out — nozzles, belts, bed surfaces. A reasonable approach is to assign a small per-hour machine cost (many sellers use $0.30–$0.75/hour) that covers replacement parts and eventual printer retirement. Skip this and you're quietly underpricing every single print you ever sell.
Building In a Failure Buffer Without Overcomplicating It
Prints fail. Spaghetti happens, beds go uncalibrated, filament runs out mid-job. Fused filament fabrication is reliable but not flawless, and a 5–15% failure buffer on top of your raw cost accounts for the prints that don't make it to the finish line. Set it too low and a bad week wipes out your margin; set it too high and your prices stop being competitive.
Here's a worked example. Say a print uses 85g of filament at $22/kg, runs for 4.5 hours on a 150W printer, electricity is $0.15/kWh, machine cost is $0.50/hour, and you want a 10% failure buffer with a 25% margin.
- Filament: 85/1000 × 22 = $1.87
- Electricity: (150/1000) × 4.5 × 0.15 = $0.10
- Machine time: 0.50 × 4.5 = $2.25
- Subtotal: $1.87 + $0.10 + $2.25 = $4.22
- Failure buffer (10%): $4.22 × 0.10 = $0.42 → total cost $4.64
- Sale price with 25% margin: $4.64 × 1.25 = $5.80
Notice how machine time, not filament, is the biggest line item there. That surprises almost everyone the first time they run real numbers instead of guessing.
Picking a Margin That Actually Works
A flat 20-30% margin is common for casual sellers, but it ignores design time, post-processing (sanding, painting, support removal), and marketplace fees if you're selling through a platform that takes a cut. If you're quoting custom work, your profit margin needs to cover labor too, not just machine and material costs. Print farms running dozens of units a day can afford thinner margins because volume covers the gap; a one-off hobbyist selling at a craft fair usually can't.
What about resin printing? The same logic applies but the numbers shift — resin is pricier per gram than filament, post-curing adds time, and isopropyl alcohol for cleaning is a real recurring cost people forget to add.
FAQs
How much electricity does a 3D printer use per hour?
Most FDM printers draw between 80 and 250 watts depending on bed heating and size, which usually works out to a few cents per hour at average residential electricity rates.
Should I include my time in the price?
If you're selling, yes. Design time, slicing, bed prep, and post-processing all take real time and should be priced separately from raw material and machine costs.
What's a reasonable failure rate to plan for?
Most reliable setups run 5-10% failure rates once calibrated properly. New printers or complex geometries can run higher until the settings are dialed in.
Does filament brand affect the cost calculation?
Only through price per kilogram. Premium filaments cost more upfront but sometimes print more reliably, which can lower your effective failure rate.
How do I weigh a print before printing it?
Your slicer software estimates filament weight and length before you start the print, usually visible right on the export or preview screen.
Is machine depreciation really necessary to calculate?
It's the line item people skip most often, and it's usually the largest cost on longer prints. Skipping it means you're not actually covering your printer's real operating cost.
What margin should I charge for custom commissioned prints?
Custom work generally supports a higher margin than stock items because it requires design or modeling time that off-the-shelf prints don't.
Can I use this calculator for resin printing too?
The structure works, but you'll want to adjust material cost per gram and factor in post-curing time and cleaning supplies separately.