The short answer
A desktop FDM printer costs roughly $0.20 to $0.50 per hour to run. Electricity is only a few cents of that; depreciation and wear parts are bigger, and failed prints quietly inflate everything. Resin machines land higher because consumables dominate, and industrial equipment runs from about a dollar to several dollars an hour.
The important consequence: your machine hour is not your hourly rate. If you charge $3 an hour and the printer costs you $0.25, the other $2.75 is paying for your labour, your overheads and your profit - which is exactly as it should be, but only if you know that is what is happening.
The four components of a machine hour
Everything that scales with runtime belongs here. Anything that scales with the job - your time setting it up, packing it, answering emails - does not; that is labour, and it is counted separately.
The formula
Machine hour = (depreciation + electricity + wear parts) ÷ (1 − failure rate)
1. Depreciation
Purchase price divided by the printing hours you expect to get out of the machine before it is retired or written off. A $400 printer that you expect to run 4,000 hours costs $0.10 an hour in depreciation. This is usually the largest single component on a desktop machine, and the one people forget entirely.
Be honest about expected life rather than optimistic. Machines are more often retired because they have been superseded than because they physically die.
2. Electricity
Average power draw over a whole print, not the peak on the label. A typical desktop FDM printer averages somewhere near 100 W once the bed has come up to temperature and the heaters are cycling - a heated chamber or a large bed pushes that up, a small resin machine sits well below it.
At 100 W and $0.25 per kWh that is 2.5 cents an hour. This is why "does 3D printing use a lot of electricity" has a boring answer: no. Unless your tariff is extreme or your machine is industrial, power is a rounding error next to depreciation.
3. Wear parts and maintenance
Nozzles, belts, bearings, PTFE tube, build surfaces, lubricant - and for resin, the consumables that dominate: FEP film, the LCD panel, IPA, gloves and filters. Add up a year of it and divide by the hours you actually printed that year. A shop spending $120 a year on wear parts across 1,500 printing hours is carrying $0.08 an hour.
4. Failure rate
The multiplier everyone omits. A print that fails at 80% consumed machine hours, electricity, wear and material and produced nothing sellable, so the successful hours have to absorb it. If 6% of your printing hours end in the bin, divide the rest by 0.94 - an effective surcharge of about 6.4%.
Track this honestly for a month. Shops that measure it are usually somewhere between 3% and 10%; shops that guess usually guess low.
A worked example
A $400 desktop FDM printer, expected to last 4,000 printing hours, drawing 100 W at $0.25/kWh, with $120 a year of wear parts over 1,500 printing hours, and a 6% failure rate:
| Component | Working | Per hour |
|---|---|---|
| Depreciation | $400 ÷ 4,000 h | $0.100 |
| Electricity | 0.1 kWh × $0.25 | $0.025 |
| Wear parts | $120 ÷ 1,500 h | $0.080 |
| Subtotal | $0.205 | |
| Failure rate | ÷ 0.94 | $0.22 |
Twenty-two cents. That is the true cost of an hour of that printer's time - and it is why a shop quoting purely on "machine hours at cost" would be working for nothing.
Typical ranges by machine class
Illustrative, using the same method. Substitute your own purchase price, tariff and consumable spend.
| Machine | Price | Expected hours | ≈ Cost per hour |
|---|---|---|---|
| Budget desktop FDM | $400 | 4,000 | $0.20–0.25 |
| Prosumer FDM | $1,500 | 6,000 | $0.40–0.50 |
| Desktop resin (MSLA) | $600 | 3,000 | $0.45–0.60 |
| Industrial SLS / large-format | $25,000 | 10,000 | $3.50–4.50 |
Resin lands above FDM despite the lower purchase price, because the LCD panel and FEP film are consumed on a schedule. Resin vs filament costs works through both in detail.
Per hour or per gram?
Both, and this is not a compromise - they measure genuinely different things. Grams measure material consumed. Hours measure the machine being unavailable for anything else. The two come apart constantly: a tall, thin, hollow part can weigh 30 g and take nine hours, while a squat solid block of the same 30 g prints in three.
Price on grams alone and you lose money on every slow part. Price on hours alone and you lose money on every dense one. A cost model that adds a per-gram material term to a per-hour machine-and-labour term tracks reality on both axes, which is why nearly every serious quoting setup uses both. The full build-up is in how to calculate 3D printing cost.
Turning cost into a rate you charge
Do not put $0.22 in the hourly rate field of your pricing setup and wonder why the business does not work. The hourly rate you charge should carry three things the machine hour does not: your labour, your share of overheads (rent, software, insurance, packaging), and margin. That is a separate calculation, covered in how much to charge for 3D printing, with the health check in 3D printing profit margin.
The reason to work out the machine hour first is that it becomes your floor. Below it you are provably losing money on runtime alone, and no volume of orders fixes that.
Set the rate once, apply it to every upload
Filaquote takes your hourly machine rate and material cost per gram as pricing settings, then derives print time and weight from each uploaded model's actual geometry - so the rate you worked out here is applied consistently to every quote, without anyone re-doing the maths per order.
Add to Shopify→FAQ
How much does a 3D printer cost per hour to run?
For a desktop FDM printer, usually between 20 and 50 cents an hour once depreciation, electricity, wear parts and failed prints are all counted. Electricity alone is only a few cents. Larger resin and industrial machines run from roughly 50 cents to several dollars an hour.
Why is the hourly rate I charge so much higher than my cost per hour?
Because the machine hour is the smallest part of the job. What you charge also has to cover your labour, your overheads and your profit. A rate of a few dollars an hour is mostly paying for you, not for the printer.
Should I price per hour or per gram?
Both, because they measure different things. Grams capture material and hours capture machine occupancy, and a tall thin part with the same weight as a squat one can take twice as long. Pricing on one axis alone under-charges whichever jobs are heavy in the other.
Does electricity make 3D printing expensive?
No. A typical desktop FDM printer averages roughly 100 watts over a print, so about 2 to 4 cents an hour at common tariffs. Depreciation and wear parts usually cost more than the power does.