How much does 3D printing really cost?
Ask what a print cost and most people quote the filament. Filament is the biggest line item, but it is not the only one — there is also electricity, wearing parts, and the prints that never make it off the build plate. Here is the full picture, with honest numbers.
Cost 1: Filament (the big one)
Standard filament commonly runs about $15–25 per kilogram, so a gram costs roughly two cents at the $20 midpoint. A 100-gram bracket is about $2 of plastic; a 30-gram keychain about $0.60; a half-kilo helmet shell about $10. Filament dominates the cost of almost every print, which is why the best cost control is simply knowing what each print uses and what is left on your spools. (Our companion guide, how much filament a print uses, works through the grams-to-dollars math in detail.)
Cost 2: Electricity (the surprisingly small one)
A typical desktop FDM printer draws roughly 50–150 watts while printing — the bed and hotend cycle on and off, so average draw is well below the power supply's rating. The math: watts × hours ÷ 1,000 = kilowatt-hours. A 10-hour print averaging 100 watts uses about 1 kWh. At residential electricity prices — commonly somewhere around $0.10 to $0.30 per kWh depending on where you live — that marathon print costs roughly 10 to 30 cents in power. Electricity is real, but for most hobbyists it rounds to spare change next to filament. Print overnight without guilt.
Cost 3: Wear and consumables
Printers consume themselves slowly. Brass nozzles are inexpensive — often just a few dollars — and last months of casual printing with plain filaments, though abrasive materials like carbon-fiber or glow-in-the-dark blends can wear one out in days. Build surfaces gradually lose their grip, PTFE tubes in Bowden setups cook and need replacing, and belts, wheels and fans all have finite lives. None of these is expensive; the trick is to budget for them instead of being surprised. A reserve of a few dollars a month covers wear for a typical home printer with room to spare.
Cost 4: Failed prints (the hidden multiplier)
The failure bin is where budgets quietly leak. If roughly one print in ten fails, then about a tenth of your filament spending produces recycling, not parts — plus the electricity and hours that went with them. On $30 of monthly filament, that is $3 a month of pure waste, and for trickier materials or experimental prints the rate can be much higher. Failures are partly tuition — everyone pays some — but dialled-in first layers, dry filament and a pre-flight check on long prints cut the rate hard. It is the cheapest cost to reduce because it buys nothing when you pay it.
A worked monthly example
Put it together for a hobbyist who prints steadily — about 1.5 kg of filament and 60 print hours a month, making around 20 finished parts. Prices are examples, not quotes: filament at $21/kg, electricity at $0.16/kWh, average draw 100 watts.
| Cost | Working | Monthly |
|---|---|---|
| Filament | 1.5 kg × $21/kg | $31.50 |
| Failed prints | ≈ 10% of filament spend | $3.15 |
| Electricity | 60 h × 0.1 kW = 6 kWh × $0.16 | ≈ $0.96 |
| Wear reserve | Nozzles, surfaces, tubes, belts | $3.00 |
| Total | ≈ $38.60 |
Twenty finished parts for about $39 works out to under $2 a part, all-in. Some owners also amortize the printer itself — a $300 machine spread over three years of use adds about $8 a month — which is a fair way to think about upgrades, but optional for a hobby budget. Either way, the shape of the answer holds: filament is roughly 80% of the true running cost, failures most of the rest, and electricity barely registers.
What about your time?
For a hobbyist, printing time is the hobby — nobody invoices themselves for watching a first layer go down. But the moment you sell prints, give quotes, or make parts for other people, time becomes a real cost line: loading and unloading, failed attempts, post-processing and packaging can easily exceed the material cost of a small part. A simple rule many sellers use is to price the machine time at a flat hourly rate on top of the all-in material cost worked out above. Even if you never sell a thing, running the numbers once is worthwhile: it replaces the vague feeling that printing is "basically free" or "surprisingly expensive" with an actual figure for your setup.
It also puts bought-versus-printed comparisons in perspective. A replacement bracket that costs $12 to buy might use $1.80 of filament and 15 cents of electricity — the printer wins easily. A large decorative object can run the other way once failures and a wear reserve are counted. Knowing your real per-print cost is what tells you which case you are in before you start.
Keeping the total down
Buy filament at sensible prices and store it dry so spools never get written off. Print the cheap draft first when you are sizing something new. Keep the failure rate down with maintenance and a dry box. And keep track of what you actually have: the value of the half-used spools on your shelf is real money you have already spent, and using them before opening fresh plastic is the easiest saving in the hobby. The Filament Calculator shows that shelf value directly — weigh your spools, save them to the inventory, and it totals the remaining grams, length, print hours and dollars for you.