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How to Calculate the True Cost of a 3D Print
Most people think of filament cost and stop there. That's why most people undercharge, or get surprised when a print costs more than they expected. The actual number has four components — and only the first one is obvious.
Start With a Real Example: The Benchy
The Benchy is the universal 3D print test model. It uses about 16g of PLA and takes 45-90 minutes depending on your printer and speed settings. Here's what it actually costs on a typical Ender 3 setup in 2026:
Electricity: 120W × 1hr ÷ 1,000 × $0.173/kWh = $0.021
Depreciation: $300 printer ÷ 3,000hr lifetime × 1hr = $0.10
Failed print buffer (10%): $0.52 × 0.10 = $0.052
Total: $0.57 per Benchy. Not $0.40 — $0.57.
That extra $0.17 is real money once you're printing hundreds of parts. Now here's the formula behind that calculation:
Electricity cost = (watts × print hours ÷ 1,000) × $/kWh
Depreciation = (printer price ÷ lifetime hours) × print hours
Failure buffer = subtotal × failure rate %
2026 Filament Prices Per Gram — Updated Reference
Filament prices jumped roughly 20-30% in early 2026 due to petrochemical supply disruptions. If you're using pre-2026 estimates in your pricing, you're likely undercharging. Here's the current market:
| Material | Price per kg (2026) | Cost per gram | Best for |
|---|---|---|---|
| PLA | $22–28/kg | $0.022–0.028/g | General prints, prototypes, hobbyist use |
| PLA HS | $24–30/kg | $0.024–0.030/g | High-speed printing (Bambu, Voron) |
| PETG | $22–32/kg | $0.022–0.032/g | Functional parts, moisture resistance |
| ABS | $20–26/kg | $0.020–0.026/g | Heat-resistant parts, requires enclosure |
| TPU | $28–45/kg | $0.028–0.045/g | Flexible parts, gaskets, phone cases |
| CF Composite | $55–80/kg | $0.055–0.080/g | Engineering parts, weight-critical applications |
| Resin (standard) | $25–50/500mL | $0.050–0.100/mL | High-detail miniatures, jewelry, dental |
After filament, electricity is the cost everyone overestimates. A typical desktop FDM printer uses 100–200W average during printing — less than your microwave on standby. At the 2026 US average of $0.173/kWh, a 10-hour print at 150W costs you $0.26 in electricity. It matters for a print farm running 24/7. For a hobbyist, it's noise.
Why Machine Depreciation Actually Matters
Your printer wasn't free. Even after you've paid for it, every print hour consumes part of its useful life. A $300 Ender 3 running 3,000 lifetime hours costs $0.10/hour in depreciation. A $800 Bambu Lab P1S over 5,000 hours costs $0.16/hour. Small per print, but if you're quoting jobs without including this, you're slowly losing money on every print you sell.
The Hidden Cost Everyone Forgets: Failed Prints
Even a well-calibrated printer fails sometimes. Layer shifts, bed adhesion failures, filament tangles — most makers experience a 5-15% failure rate. A 10% buffer on every print means you've built in the cost of the one-in-ten that didn't make it. If you're using quality filament from eSUN, Bambu, or Prusament and your printer is dialled in, 5% is realistic. If you're running a cheap no-name spool, budget 15-20%.
How to Price 3D Prints to Sell — The Real Formula
If you're selling prints on Etsy, through local commissions, or running a small print farm, pricing from raw cost alone will eventually lose you money. Here's how professional makers price their work.
The Standard Maker Pricing Formula
Example: 100g PLA print, 6 hours, your hourly rate $15/hr:
Material = (100 ÷ 1,000) × $25 = $2.50
Material × 3 = $7.50
Labor = $15 × 6hrs = $90
Selling price before fees: $97.50
Etsy takes 6.5% + listing fees. Add 10% on top for platform costs.
That $97.50 might look high for a 100g print, but consider: you spent 6 real hours of machine time, the part is custom, and you're providing a skilled service. Makers who charge $0.05/gram for everything end up working for less than minimum wage once they account for all their time.
FDM vs Resin — True Cost Comparison
The sticker price of resin per mL versus filament per gram doesn't tell the full story. Resin printing has mandatory consumables that add a fixed monthly overhead regardless of how much you print.
| Cost Factor | FDM / Filament | Resin (MSLA) |
|---|---|---|
| Material cost | $0.022-0.032/g (PLA/PETG) | $0.050-0.100/mL resin |
| Electricity | 100-200W avg ($0.02-0.035/hr) | 30-60W ($0.005-0.010/hr) |
| IPA / wash solution | None required | $0.30-0.80 per print |
| FEP film replacement | None | $15-40 every 1-3 months |
| LCD screen replacement | Never (most printers) | $40-150 every 500-2,000 hrs |
| Safety gear (gloves, mask) | Not required | $15-30/month ongoing |
| Print detail quality | 0.1-0.2mm layers | 0.01-0.05mm layers |
| Best use case | Functional parts, large prints | Miniatures, jewelry, dental |
| Monthly overhead (low volume) | $0-5 | $30-60 |
For a hobbyist printing 20 hours per month, FDM is clearly cheaper. Resin makes financial sense when you need detail that FDM physically cannot achieve — miniatures, dental models, jewelry casting masters. Don't choose resin because you think it looks cooler. Choose it when the application demands it.
Hidden Costs Most 3D Printing Calculators Miss
- Post-processing time: Sanding, painting, or support removal is real labor. A print that takes 4 hours to make and 2 hours to finish has 6 hours of your time in it.
- Nozzle wear: A brass nozzle lasts 3-6 months with standard filaments. Carbon fiber and abrasive materials destroy them in days without a hardened steel nozzle ($15-40). Factor this into CF and composite prints.
- Bed adhesion consumables: PEI sheets, glue sticks, hairspray, and BuildTak replacements add up over time.
- Design time: If you created or modified the model yourself, that time has value. Most makers completely forget to price this.
- Shipping and packaging: A $1.50 print shipped in a $2 padded mailer with $5 postage costs $8.50 before you've made anything.
5 Ways to Cut Your 3D Printing Cost Per Print
You don't always need better equipment. Small setting changes and smarter purchasing habits cut cost more than upgrading to a new printer.
Reduce Infill — The Fastest Win
This is the single highest-impact setting change most people never make. Dropping infill from 20% to 10% saves 15-25% of filament on most solid models. A 100g print at 20% infill becomes roughly 85g at 10% — saving $0.40-0.60 per print. For parts that don't bear load, 10-15% gyroid or honeycomb infill is structurally indistinguishable from 20%. The only time you need 40%+ infill is for mechanical parts under real stress.
Buy in 2kg or Multi-Pack Spools
The price per gram difference between a single 1kg spool and a 3-pack or 2kg spool is typically 15-25%. At $25/kg for singles versus $19/kg in bulk, a 100g print saves $0.60 in material alone. For anyone printing regularly, the math is obvious — buy bulk, store dry, use in order.
Dry Your Filament — Seriously
Wet filament causes more failed prints than almost any other factor outside of bad levelling. Filament that's been sitting open in humid air absorbs moisture and starts to bubble, pop, and string during printing. A $30 food dehydrator or dedicated filament dryer pays for itself in prevented failures within a few months for regular printers.
Use Failure Rate as a Budget Line
Instead of being surprised when a print fails, build 10% into every quote and job estimate from the start. When a print succeeds without failing, that buffer becomes profit. When it fails, you're covered. Print farms treat failure rate as a standard operating cost — you should too.
Consider Home Filament Recycling for High Volume
In 2026, compact filament extruders that process failed prints and support structures back into usable spools have dropped to $400-800. At $25/kg filament cost and 200g of waste per week, the breakeven on a basic extruder is roughly 18-24 months. Not for casual hobbyists — but for anyone running a print farm, it changes the economics significantly.