Learn & Understand

The Real Cost of Printing (Beyond Filament and Power)

If you've ever priced a print job by adding up filament and electricity and still lost money on the batch, you've run into the two costs almost every beginner pricing calculator leaves out entirely: machine depreciation and failure rate.

The Cost Nobody Adds to the Formula: Printer Depreciation

A $400 printer doesn't last forever. Nozzles wear out from abrasive filaments, PTFE tubes degrade and start causing jams, belts stretch, and bearings wear. If you treat the printer itself as free once it's paid for, every quote you give undercuts your actual long-term cost. A simple way to fold this in: take the printer's purchase price, divide by its realistic service life in hours (many hobbyist FDM machines are good for roughly 3,000-5,000 print hours before needing significant part replacement), and you get a per-hour depreciation rate you can add straight into any per-hour cost model.

Example: A $400 printer rated for 4,000 hours of service depreciates at $0.10/hour. On a 12-hour print, that's $1.20 - often more than the electricity cost for the same job.

The Cost Nobody Talks About: Failure Rate

If 1 in every 10 prints fails partway through (a realistic figure for anyone running unattended overnight prints regularly), then every successful print is quietly subsidizing the material and time lost on the failures. The math is straightforward but rarely applied: divide your true cost per print by (1 minus your failure rate) to find the price you actually need to charge to break even across a batch, not just on the print that happened to succeed.

How Print Farms Actually Price Jobs

Commercial print services rarely use a single formula. Most blend three models depending on the job: a per-gram rate for simple, reliable, low-detail parts (fastest to quote); a per-hour rate for jobs where machine time, not material, is the real constraint (multi-color, slow high-detail prints); and a flat per-part rate for anything they've printed enough times to know the real cost without recalculating. If you're pricing your own work, matching the model to the job type - rather than forcing every quote through the same material-and-power formula - tends to produce more realistic numbers.

A Realistic Side-Hustle Break-Even Scenario

Say you're selling a part that costs $2.00 in material and takes 3 hours of print time. At $0.10/hour depreciation and a 10% failure rate, your true attempt cost is $2.00 + $0.30 = $2.30, and your break-even price is $2.30 / 0.9 = $2.56 - noticeably higher than the $2.00 figure a simple material-only calculation would suggest, before you've added a cent of profit margin or paid yourself for the time spent babysitting the print and packaging the result.

Putting It Into Practice

Add depreciation and failure-rate adjustment on top of whatever your material-and-electricity total comes out to, before applying a profit markup - not after. Skipping this step is the single most common reason hobbyists selling prints find their "profitable" side business barely breaking even once a few failed prints and a worn-out nozzle are accounted for.