A desktop FDM printer is not the power hog people expect. Peak draw during heat-up can hit 300–500 W, but once printing, the heaters duty-cycle and the average settles at roughly 50–150 W — about the same as a laptop or a bright light fixture.
Typical power draw
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Compact bed-slinger (Prusa MINI class): 40–80 W average while printing.
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Standard 220–250 mm printer with heated bed: 70–120 W average.
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Large-format or enclosed printers (heated chamber): 150–350 W.
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Resin (MSLA) printers: 30–80 W — the UV array is efficient; curing/washing stations add a little more.
The formula
Electricity cost = print hours × average watts ÷ 1000 × your price per kWh. Example: 6 h × 150 W = 0.9 kWh; at $0.30/kWh that is $0.27. Even a 48-hour print on the same printer is only about $2.16.
How to find your real numbers
Your electricity rate is on your utility bill (or your smart-meter app). For the printer, a $15 plug-in energy meter between the wall and the printer gives you the true average for your machine, slicer profile and ambient temperature — measure one representative print and reuse the number.
Reducing the cost
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Lower the bed temperature after the first layers — the bed is the biggest consumer.
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Enclose the printer: less heat loss means less duty-cycling.
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Print multiple parts per plate: one heat-up amortised over more parts.
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Bigger nozzles and thicker layers cut print hours directly.
Electricity is usually the smallest of the four cost factors — filament, machine wear and your time matter more. Enter your wattage and tariff in the calculator to see all four side by side.
Frequently asked questions
Does a 3D printer use a lot of electricity?
No. At 50–150 W average, a typical printer running 6 hours uses 0.3–0.9 kWh — between $0.10 and $0.30 at a $0.30/kWh rate.
How much does it cost to run a 3D printer for 24 hours?
At a 100 W average and $0.30/kWh: 2.4 kWh ≈ $0.72 per day. Large enclosed printers can be 2–3× that.
Do resin printers use more power than FDM?
Usually less while printing (30–80 W), since there are no large heaters — but washing and curing stations add a small extra step.