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A typical single-color FDM project costs roughly the price of its filament plus a small electricity charge, but the exact total depends on grams used, print time, your tariff, and wasted material. Calculate filament as (grams ÷ 1,000) × spool price per kilogram. Calculate electricity as (average watts ÷ 1,000) × print hours × price per kWh. Then add supports, brims, purge lines, failed prints, machine wear, labor, and finishing if you need a true project cost.
For example, 100 g of PLA at €17.90 per kilogram costs €1.79. A five-hour print averaging 80 W uses 0.40 kWh; at an illustrative €0.30 per kWh, electricity adds €0.12. The variable subtotal is therefore €1.91 before waste and other overheads.
How do you calculate the cost of a 3D print?
Use separate material and electricity calculations, then add realistic waste. Keeping the inputs separate shows whether filament, power, or failed work is driving your cost.
| Cost component | Formula | Input you need |
|---|---|---|
| Filament | (filament grams ÷ 1,000) × spool price per kilogram |
Slicer-estimated mass and your actual spool price |
| Electricity | (average watts ÷ 1,000) × print hours × electricity price per kWh |
Measured or estimated average power, print duration, and local tariff |
| Waste allowance | usable-cost subtotal × expected waste percentage |
Supports, purge material, prototypes, and failure history |
Electricity is billed in kilowatt-hours, not watts. Divide watts by 1,000 before multiplying by hours. A power-supply label such as 350 W states a maximum capacity, not what the printer normally draws during a print.
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How much filament will your project use?
The slicer’s material estimate is the best starting point because it includes the selected layer height, infill, walls, supports, and build-plate features. Enter the grams shown for the exact profile you intend to print, rather than estimating from the model’s solid volume alone.
Step 1: Read the slicer estimate
Record filament mass in grams and, if available, the separate totals for the model, supports, skirt or brim, and purge material. A multicolor or multi-material job can use substantially more than the visible object because each color change may create a purge tower or line.
Step 2: Use your spool’s delivered price
Divide the price you actually paid by the spool’s net kilograms. Include sales tax and shipping when you are comparing the cost of different materials. Color, brand, regional pricing, and promotional discounts can change the result, so a historical study input should not be treated as a current market average.
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A peer-reviewed Sustainability cost model used PLA at €17.90 per kilogram and a density of 1.24 g/cm³. At that study price, 100 g costs €1.79 before waste. The same model used PETG at €20 per kilogram and a density of 1.29 g/cm³; those are 2021 model inputs, not universal retail prices today.
| Example input | Calculation | Material cost |
|---|---|---|
| 100 g PLA at €17.90/kg | 0.100 × €17.90 |
€1.79 |
| 250 g at €24/kg | 0.250 × €24 |
€6.00 |
| 40 g at $30/kg | 0.040 × $30 |
$1.20 |
Do not confuse density with cost. Density helps convert a model’s volume to mass, but the slicer’s mass estimate already accounts for the actual infill and shell settings.
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How much electricity does a 3D printer use?
There is no single per-hour figure that applies to every printer. Bed temperature, chamber temperature, nozzle temperature, ambient conditions, fans, motion speed, and the printer’s electronics all change consumption.
The practical equation is cost = (watts ÷ 1,000) × hours × price per kWh. If a printer averages 75 W for three hours, it uses 0.075 × 3 = 0.225 kWh. Multiply that energy by your utility’s current per-kWh rate.
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A plug-in power meter records energy at the outlet and captures heater cycling, fans, motors, the control board, and the power supply’s losses. Measure a complete print from startup through shutdown if you want a realistic average. A meter is more useful than multiplying the power-supply maximum by the print duration.
Use slicer time as the primary duration
The European Commission Joint Research Centre notes that a print can take “anywhere between 10 minutes and several days,” depending on the printer, settings, size, and geometry. Use the slicer’s predicted time for the specific job, then replace it with the observed duration when the print finishes. Pauses, filament changes, calibration routines, and failed attempts can make elapsed time longer than the original estimate.
What do measured printers actually consume?
Published measurements show why a generic wattage assumption can mislead. A 2024 desktop FFF study reported the following total energy for individual test runs:
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| Printer | Energy for the reported test run |
|---|---|
| Anet A8M | 0.05625 kWh |
| Creality CR10s PRO | 0.11675 kWh |
| Ender 3 V1 | 0.09375 kWh |
| Ender 3 V2 | 0.091 kWh |
| Prusa i3 MK3 | 0.08175 kWh |
| Raise3D Pro2 | 0.18975 kWh |
These are machine- and test-specific totals, not universal values per hour. The test duration, temperatures, geometry, and operating conditions determine how transferable they are.
A 2026 measurement report found approximately 75 W average over a three-hour PLA print on a Bambu Lab A1 Mini and approximately 95 W on a Creality K1. Treat both as reported measurements from that source, not guarantees for another profile or environment.
A broader 2023 study measured one-hour standby energy from 0.03 to 0.17 kWh across six printers. Include standby, preheating, cooldown, and connected accessories when comparing an entire workflow rather than one active print.
Which printer parts use the most energy?
Heating the bed and running the printer’s electronics usually matter more than the physical energy required to melt the polymer. A component-level model of a 1-hour-1-minute PLA print reported 107.14 Wh of AC energy and 3.83 m of filament.
| Modeled component or activity | Reported energy allocation |
|---|---|
| Bed heating | 53.20 Wh |
| Logic and control electronics | 46.72 Wh |
| Extruder heating | 32.99 Wh |
| Forced-convection fan operation | 23.10 Wh |
| Polymer melting itself | 0.76 Wh |
The allocations above come from the model’s separate component accounting and should not be added to the stated 107.14 Wh AC total as if they were independent meter readings. They do show the relative point: maintaining temperatures and powering hardware can dominate the energy budget, while melting energy is a small share.
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What is the total cost of a real example?
Assume a slicer predicts 100 g of PLA and a five-hour print. Use the study’s illustrative PLA input of €17.90 per kilogram only as an example, then substitute your own spool price.
- Material:
0.100 kg × €17.90/kg = €1.79. - Energy: An 80 W measured average equals 0.08 kW.
0.08 kW × 5 h = 0.40 kWh. - Electricity: At an example tariff of €0.30/kWh,
0.40 × €0.30 = €0.12. - Variable subtotal:
€1.79 + €0.12 = €1.91.
The €0.30 tariff is illustrative; use the rate on your bill, including any applicable taxes or time-of-use difference. The €1.91 subtotal excludes supports not shown in the 100 g estimate, purge material, failed prints, depreciation, labor, post-processing, and packaging.
How should you account for supports, failed prints, and other waste?
Apply a waste allowance based on your own workflow instead of hiding waste inside an optimistic model estimate. Keep these items visible:
- Support structures, rafts, brims, skirts, and purge lines included or excluded by the slicer estimate.
- Test towers, calibration pieces, and filament used while loading or unloading.
- Failed prints caused by adhesion, warping, clogged nozzles, power interruptions, or incorrect settings.
- Material discarded during color changes or multi-material transitions.
- Electricity consumed during preheating, homing, bed leveling, and repeated attempts.
If your slicer reports 100 g for the successful object but you normally lose another 15 g to supports and failed starts, price 115 g rather than 100 g. For repeat work, weigh discarded filament for several jobs and calculate an average waste rate; a single unusually clean or failed print is not a reliable allowance.
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Is 3D printing expensive compared with other making methods?
For a small single-color FDM part, filament and electricity are often modest variable expenses. The economics change when a project is large, uses costly engineering filament, requires many prototypes, runs a heated chamber, or has a high failure rate.
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Compare workflows using the same part and quality target. The meaningful axes are measured average watts, bed and chamber temperature, print time, filament price per kilogram, expected waste and failure rate, and whether multicolor purges or post-processing add material and energy. A printer that draws more power but finishes in half the time may use less energy overall; a slower machine with low average watts can still consume more because it runs for longer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can you measure your own project step by step?
- Slice the exact model. Save the estimated grams, print time, supports, brim, and any purge amount.
- Record material pricing. Divide the delivered spool price by its net kilogram weight, keeping currency consistent.
- Measure the printer. Connect a plug-in power meter and reset its energy counter before starting.
- Run the complete job. Include warm-up and normal cooldown if those stages are part of your workflow. Note pauses, filament changes, or restarts.
- Read watt-hours or kilowatt-hours. Convert watt-hours to kilowatt-hours by dividing by 1,000.
- Apply your tariff. Multiply measured kWh by the applicable price for the time the print ran.
- Add actual waste. Weigh failed parts and discarded support or purge material, then add their material cost.
- Keep a job record. Store grams, measured kWh, elapsed time, tariff, and failure notes so future estimates use your own averages.
What common costing mistakes should you avoid?
- Using the power-supply maximum: It is a ceiling, not a typical print average. Measure outlet consumption or use a defensible average from the same printer and profile.
- Multiplying watts by minutes: Convert minutes to hours and watts to kilowatts before calculating kWh.
- Ignoring tariff timing: A time-of-use plan can charge different rates overnight and during peak periods.
- Pricing only the visible model: Supports, purge lines, brims, and failed attempts consume material too.
- Transferring one printer’s result to another: Bed size, insulation, chamber heating, firmware behavior, and ambient temperature change consumption.
- Presenting an old spool price as current: The €17.90/kg PLA and €20/kg PETG figures come from a 2021 model. Enter today’s local price for a current estimate.
- Assuming slicer time is guaranteed: Real elapsed time changes with pauses, calibration, speed limits, and interruptions.
What should a full project quote include?
For personal budgeting, filament plus electricity may be enough. For a client quote or business decision, add machine depreciation or lease cost, maintenance parts, nozzle and build-surface wear, software or design time, operator labor, post-processing, packaging, and shipping. Allocate those costs consistently per print hour or per job; do not mix them into the electricity rate.
Report the assumptions with every estimate: material type and price, slicer grams, measured or assumed average watts, print duration, electricity tariff, waste allowance, and whether labor or finishing is included. That makes two quotes comparable even when their printers and local utility rates differ.
Frequently Asked Questions
Does a larger nozzle always make a print cheaper to run?
Not necessarily. A larger nozzle can shorten print time, but the wider extrusion may change the grams used, surface requirements, and support strategy. Measure both material mass and elapsed energy for the profiles you are comparing.
Should I include the printer’s standby electricity in a project price?
Include it when the printer remains powered between jobs or when you are comparing a complete production workflow. For a one-off active-print estimate, report standby separately so readers can see which assumption changed the result.
Why did two identical-looking prints produce different electricity costs?
Heater duty cycle, ambient temperature, first-layer preparation, fan speed, pauses, and bed or chamber temperature can differ even when the finished parts look the same. Outlet measurements reveal those differences better than the model’s dimensions.
How do I price a multicolor print fairly?
Use the slicer’s total mass for every loaded material, including purge towers and transition lines, and price each filament at its own kilogram rate. Add the measured energy for the longer run and any failed color-change attempts.
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