A hobbyist with three printers in a garage and a print-farm operator running twenty machines can both be losing money on every order — and neither one will notice until the credit card bill arrives. The reason is almost always the same: they priced the job off the slicer's filament estimate and called it a day.
Filament is real money, but it's rarely more than a third of what a print actually costs you. The rest — machine time, electricity, the print that failed at 80% and had to be re-run, the ten minutes of post-processing, the packaging — quietly disappears into "overhead" and never makes it into the quote. Do that consistently across a hundred jobs a month and you can be running a full, busy shop that's structurally unprofitable.
This guide walks through how to actually cost a print, how to depreciate a growing printer farm the smart way, and how to decide between Section 179 and bonus depreciation when you're staring at a spreadsheet full of new Bambu Lab or Prusa hardware.
Why "Cost = Filament Weight × Spool Price" Is Wrong
Most new print-for-hire operators build their first quote in about thirty seconds: multiply the grams the slicer reports by the price per gram of the spool, add a little for good measure, and send the quote. It feels rigorous because it involves a number from the slicer. It isn't.
Filament typically makes up only 20–30% of what a print genuinely costs to produce. The rest is hiding in five places:
- Machine time. A printer isn't free to run — it's a depreciating asset that needs to earn back its purchase price, plus electricity, plus the maintenance and part replacement that comes with hours on the clock.
- Failed prints. Nobody prints at 100% success. Even experienced, well-tuned print farms run 2–5% failure rates, and less experienced operators can see 8–25%. A failed print at hour six of an eight-hour job consumes almost all the same resources as a successful one — it just doesn't generate revenue.
- Post-processing labor. Support removal, sanding, bed leveling checks, packaging — this is real time that has to be paid for, even if you're the one doing it.
- Consumables. Nozzles wear out. Build plates get replaced. You're going through isopropyl alcohol, glue stick, and painter's tape faster than you'd think.
- Overhead. Rent (even a corner of your garage has an opportunity cost), insurance, software subscriptions, internet, and the electricity that keeps machines running 24/7.
If you only price for the filament, you're implicitly pricing your machine time, your failure risk, and your own labor at zero.
Building an Honest Per-Print Cost
The good news is that once you separate these buckets, per-print costing is just arithmetic. Here's the structure that holds up whether you're running one printer or fifty.
1. Material cost
Track filament (and resin, powder, or metal feedstock) as inventory, not as a lump "supplies" expense. Set up each filament type and color as its own line item, priced per gram, and record grams consumed per job. This matters more than it sounds like it should: it's the only way to know that your $15/kg generic PLA and your $65/kg carbon-fiber nylon are not, in fact, the same input cost, and it's what lets you close the loop between "grams the slicer estimated" and "grams actually pulled off the spool" over a month of production.
Typical FDM material pricing: $15–$80 per kg depending on material (PLA at the low end, engineering filaments like PA-CF or PEEK at the high end).
2. Machine time (depreciation + electricity + maintenance)
This is the step most operators skip entirely, and it's the biggest one. A printer is a piece of capital equipment with a useful life — commonly modeled around 3 years — and its cost needs to be spread across every hour it runs, the same way a bakery spreads the cost of its oven across every loaf.
A simple version: take the printer's purchase price, divide by its expected useful life in hours (a machine running 8 hours a day, 300 days a year, for 3 years is roughly 7,200 hours), and you get a per-hour depreciation rate. A $3,000 printer with that duty cycle depreciates at roughly $0.42/hour in machine cost alone — before you've added a cent of electricity or maintenance reserve.
Add:
- Electricity: printer wattage × hours run × your utility rate.
- Maintenance reserve: nozzles, PTFE tubes, belts, and the occasional hotend rebuild aren't optional — budget a small per-hour amount so a $40 nozzle swap doesn't come as a surprise expense that eats a week's margin.
3. Failure allocation
This is the step that separates break-even shops from profitable ones. If your farm runs a 10% failure rate, then for every 10 successful prints you're actually consuming the material and machine time of 11. The fix isn't to hope failures don't happen — it's to build the expected failure rate directly into your price. Divide your material-plus-machine cost by (1 − failure rate) to get your real cost per successful unit. At a 10% failure rate, a print that "should" cost $3 in raw inputs actually costs closer to $3.33 once you account for the one-in-eleven print that doesn't make it.
Track your actual failure rate by cause (bed adhesion, warping, power loss, slicer error) for a month. Most shops are surprised by which failure mode dominates — and fixing that one thing (better bed leveling routine, an enclosure for warp-prone materials, a UPS for power blips) often pays for itself faster than any pricing adjustment.
4. Labor and overhead
Whether you're a solo operator or running a small team, your time has a market rate — commonly estimated at $30–$60/hour for design, quoting, and post-processing work in this space. If you're not paying yourself, you're still incurring that cost; it's just invisible until you try to hire your first employee and discover what the job actually costs to staff (commonly $2,500–$4,500/month loaded, once payroll taxes and benefits are included).
Layer in fixed monthly overhead — rent, insurance, software, internet — divided across your expected monthly print hours to get a per-hour overhead rate.
Putting it together
A defensible per-print price looks like:
Price = (Material cost + Machine-time cost) ÷ (1 − failure rate)
+ Labor time × labor rate
+ Overhead allocation
+ MarginMany established print-for-hire shops simplify this in practice to a rule of thumb — charging roughly 10x raw material cost, plus a flat per-hour machine fee (often $2–$8/hour for resin, a comparable range for FDM), plus $100/hour or more for any custom design work. That multiplier isn't arbitrary; it's a shorthand that already bakes in failure risk, labor, and overhead so you don't have to recompute the full formula for every small job.
Depreciating a Growing Printer Farm
Once you move from "a printer" to "a fleet," depreciation stops being a rounding error and starts being one of the biggest levers on your tax bill.
Section 179 vs. bonus depreciation
Both let you deduct the cost of new equipment in the year you buy it instead of spreading it over several years — but they work differently, and the choice matters more than most new shop owners realize.
- Section 179 lets you elect to expense qualifying equipment immediately, up to an annual cap ($2,560,000 for 2026, phasing out above $4,090,000 of total equipment purchases). It's flexible — you can choose which assets and how much of each to expense, which is useful if you want to smooth deductions across profitable and lean years.
- Bonus depreciation was restored to 100% for property acquired after January 19, 2025 under the One Big Beautiful Bill Act (OBBBA). It's less flexible (it generally applies to an entire asset class at once, not a hand-picked amount), but it has no annual dollar cap, which matters if you're buying more equipment in a single year than Section 179's limit covers.
The practical rule: the IRS requires you to apply Section 179 first, then bonus depreciation on what's left. For most solo shops and small print farms buying a handful of machines a year, the two rules combined mean you can often deduct 100% of a new printer's cost in the year you place it in service — the real decision is less "179 or bonus" and more "how much of this year's equipment spend do I want to deduct now versus smooth into future years," which is a conversation worth having with a tax professional once you're buying more than one or two machines annually.
Why the useful-life number still matters even with 100% deduction
Even if you expense the full purchase price for tax purposes in year one, you should still track depreciation on your management books using the printer's real useful life (commonly 3 years for FDM hardware run commercially). Tax depreciation and book depreciation are allowed to diverge — and they should, because your per-hour machine cost calculation above needs the real economic life of the asset, not the tax-accelerated one, or your pricing will understate machine cost the moment the equipment tax deduction is gone.
Common Bookkeeping Mistakes in a Print-for-Hire Business
- Treating filament as a pure expense instead of inventory. If you're selling printed parts (not just a service on customer-supplied files), unused filament and finished goods sitting on a shelf are assets, not expenses, until they're consumed or sold. Booking them as expense-on-purchase understates your assets and distorts your margin by month.
- Ignoring failed prints in COGS. A failed print isn't a "loss" line buried at the bottom of the P&L — it's a cost of producing your successful units, and it belongs in your cost-of-goods-sold calculation, not written off separately.
- Mixing personal and business printer use. If a printer does both client work and personal projects, only the business-use portion is deductible. Keep a simple hours log if the split isn't obvious.
- Not separating machine-hours by printer type. Resin and FDM machines have very different electricity, consumable, and depreciation profiles. Lumping them into one "printer cost" average will misprice whichever type you run less of.
- Skipping quarterly estimated taxes once revenue is steady. Print-for-hire income often starts as a side hustle and crosses into "this needs quarterly estimated payments" territory before the operator notices.
Keep Your Print Farm's Books as Precise as Your Prints
If you can calibrate a printer to hold a 0.1mm tolerance, you can hold your books to the same standard — but only if your financial records are as inspectable as your G-code. Beancount.io gives makers and print-shop owners plain-text accounting: every material purchase, machine-hour allocation, and failed-print write-off lives in version-controlled files you can audit line by line, with no proprietary format locking up your data. Get started for free and bring the same precision to your bookkeeping that you bring to your builds.