How Much Does 3D Printing Cost? The Math, Line by Line

The Three-Line Receipt

Every print generates the same three costs: the plastic in it, the electricity that melted it, and the amortized wear on the machine. Start with a concrete one, because the answer is smaller than most people expect. A typical hobby print, three hours on the plate using 80 grams of PLA at the usual $20 per kilogram, costs about $1.60 in filament. The power for those three hours runs a nickel to a dime at typical US rates. Total: roughly $1.70 for a finished part.

That number reframes the hobby. The machine is the big purchase and the prints are nearly free, which is why the advice to buy a reliable printer first and cheap filament second keeps coming up in every budget thread. The rest of this post runs the full math: what year one costs, how to price any print yourself, where resin changes the arithmetic, and the failure tax that no spreadsheet includes and every beginner pays.

Year One: the Real Budget

The sticker price is the entry fee, not the budget. Working from current Amazon listings scanned in September 2026, the entry tier looks like this: Creality's Ender 3 V3 SE bundle with a spool of PLA included sits at $201.74, and Bambu's A1 mini kit is $249. Step up to the full-size Bambu A1 at $299.99, or to $419 for the A1 combo with the AMS lite if you want multicolor from day one.

Scan prices move with sales, so read the column as a range. Filament assumes a light first year of PLA, around three to five spools. Wear parts mean spare nozzles, build-plate sheets, and PTFE tube, the $20-40 of small stuff that eventually needs replacing. Notice what is absent: for a beginner printing PLA on a modern machine, there is no meaningful third category. No upgrade treadmill, no mandatory accessories. The buying-guide argument that a reliable $300 printer beats a $200 printer plus a year of upgrades holds here.

The Formula, So You Can Price Any Print

Filament cost per print is grams times dollars per gram. Power cost is average wattage times hours, divided by 1000, times your electricity rate. In one line:

cost = (grams x price per kg / 1000) + (watts x hours / 1000 x price per kWh)

The worked example from the receipt: 80 grams of PLA at $20/kg is 80 x 20 / 1000 = $1.60. A desktop machine printing PLA draws on the order of 50 to 150 watts depending on how hard the heated bed and nozzle cycle, so three hours is roughly 0.15 to 0.45 kWh. At the $0.15 per kWh rate used across US residential comparisons, that is two to seven cents. Call it $1.65 to $1.70 total.

Run it again for a bigger PETG part: 120 grams at $25/kg is $3.00 of filament. Four hours at similar wattage adds maybe a dime. About $3.10. Electricity never moves the total, which is the point of running the formula twice. People who ask whether a 3D printer "uses a lot of electricity" are usually picturing a space heater. It is a bright lightbulb.

One honest caveat: the wattage range above is an estimate for typical desktop FDM machines, not a measured spec. If precision matters to you, check your printer's power supply rating and assume half to two-thirds of it as the printing average.

Resin Runs on a Different Denominator

Resin printing swaps filament for liquid photopolymer sold by the kilogram bottle, around $25-40 each, and adds consumables that FDM does not have: nitrile gloves, isopropyl alcohol for washing, filters, and eventual FEP film replacement. The wash-and-cure station is a real hardware line too, $80-150 new. Our resin beginner guide carries the full setup arithmetic, which lands near $450-750 for a safe working station even though the printers themselves advertise at $170-300.

Per part, resin can absolutely compete, and for small detailed miniatures it usually wins: a plate full of figures consumes a few dollars of resin. The resin budget problem is not per part. It is the fixed safety-and-cleanup overhead around every part.

The Failure Tax Nobody Budgets

Here is the line item missing from every cost calculator. Prints fail, especially early. While you are learning, a realistic expectation, and the one long-time owners hand out on r/3Dprinting, is that somewhere between 10 and 15 percent of prints end in the bin: a detached first layer, a warp, a spaghetti tangle from a knocked-off part. The estimate comes from community consensus rather than a formal study, so treat it as a planning number, not a measurement.

The fix is to budget it. If you plan $60 of filament for the season, plan to keep $50 of parts. Cost per good print, not cost per print, is the number that matters, and it is why the cheap-machine-then-upgrades path gets expensive in a way the receipt never shows: a flakier machine taxes every single print. Buyers weighing that trade can see it laid out in our small-business printer guide, where failure rate is treated as a line item because at volume it becomes one.

Frequently Asked Questions

How much does 1kg of PLA print?

A kilogram is roughly 333 prints at 3 grams each for miniatures, or about 12 average 80-gram hobby prints. Spools run $15-25 for PLA in 2026, so a month of casual printing costs less than a pizza night.

Does a 3D printer use a lot of electricity?

No. Typical desktop machines draw on the order of 50-150W while printing, so a three-hour print costs two to seven cents at $0.15/kWh. Even a heavy month of printing stays under a few dollars of power.

Is resin more expensive than filament printing?

Per liter of material resin is comparable, $25-40 per kilogram bottle, but the setup overhead is higher: wash-and-cure station, PPE, alcohol, and ventilation push the working starter budget to $450-750 versus about $300 for FDM. Per small part, resin often comes out cheaper.

What is a realistic monthly spend after the first year?

For a hobbyist printing a few parts a week, one spool a month, $15-25, plus a few dollars of power and the occasional wear part. Call it $20-30 a month, plus whatever a new project tempts you into.

Once the per-print math is this favorable, the machine is the only decision with real money in it. Versa AI does the arithmetic across the two printers on your shortlist, sticker to consumables, while you decide where the budget goes.