Will a 3D printer add a lot to my power bill?

Almost certainly not. At 100W average draw for 40 hours per week, that's 208 kWh per year. At US average rates, $37 per year. At expensive rates like California, $73. Compared to a refrigerator (400 kWh/year) or central AC (2000+ kWh/year), a 3D printer is a rounding error.

Does leaving the printer on between prints cost much?

No. Most modern printers idle at 5 to 15W (controller, screen, optional fans). At 10W idle for 24 hours, that's 0.24 kWh, about 4 cents at US average rates. Over a year of idling, maybe $15 to $25.

What about a heated chamber?

This is where draw gets meaningful. A heated chamber can pull 200 to 400W when active, and some run continuously. A chamber held at 40°C for a 12-hour print can easily double the total print energy. Budget accordingly if you have one.

Are newer printers more efficient?

Slightly. Modern printers like Bambu's lineup and Prusa's MK4 use silent steppers, better thermal insulation on the bed, and PID temperature control, which all reduce average draw. A 2020 Ender 3 averages around 125W during active printing. A 2024 Bambu P1S averages closer to 95W. Small improvement, real but not transformative.

How do I measure my actual printer wattage?

A Kill A Watt or similar wattage meter plugs into your outlet and reads real-time draw. Under $25 on Amazon, lasts forever, useful for measuring any appliance. Plug the printer into it, print something representative, check the kWh readout at the end.

How much electricity does a 3D printer actually use?

One of the most common questions from new 3D printer owners is whether the hobby is going to spike their electric bill. The short answer is no. The long answer has some nuance around printer class, how often you print, and whether you run any accessories, but even at worst case, a hobby 3D printer is one of the cheapest things in your house to run.

Typical wattage by printer class

Power draw varies during a print. The bed heater pulls a lot when heating up and cycles on and off to maintain temperature. The hotend is similar, smaller draw. The motors, controller, and fans add a steady trickle.

Average wattage during an active print:

Bambu X1C: 115W average, 250W peak during bed heatup
Bambu P1S: 95W average
Bambu A1 / Mini: 80 to 95W average (A1 Mini is lower)
Prusa MK4: 95W average, 200W peak
Creality Ender 3 (stock): 125W average
Creality K1 Max: 150W average (larger bed)
Voron 2.4 or custom CoreXY: 140 to 180W depending on build

These numbers are the full-print average including bed and hotend heat cycles. Peak draw during bed preheat can double for the first few minutes.

The math: hourly cost

Electricity is billed in kilowatt-hours (kWh). 1 kWh is 1000 watts running for 1 hour. Math:

cost = (watts / 1000) × hours × rate_per_kWh

Worked examples at the US average rate of $0.18 per kWh:

Bambu X1C, 12-hour print: (115/1000) × 12 × 0.18 = $0.25
Ender 3, 12-hour print: (125/1000) × 12 × 0.18 = $0.27
Prusa MK4, 5-hour print: (95/1000) × 5 × 0.18 = $0.09

The Electricity Cost Calculator does this for any wattage, duration, and rate combination.

Regional rate variation matters more than printer choice

US electricity rates range roughly 3x between cheap and expensive states:

Louisiana, North Dakota, Washington: around $0.12/kWh
Most of the US: $0.14 to $0.20/kWh
California, Massachusetts, New York: $0.25 to $0.30/kWh
Hawaii: $0.35 to $0.40/kWh

Outside the US: EU averages around €0.27/kWh, UK similar at £0.27, Canada around C$0.17, Australia closer to A$0.32. Your actual rate is on your utility bill in the "supply" or "energy charge" line.

Annualized: what a real hobby costs

Typical hobbyist prints 20 to 40 hours per week. At 40 hours and 100W average, that's 4 kWh per week, 208 kWh per year.

At cheap US rates ($0.12/kWh): $25 per year
At US average ($0.18/kWh): $37 per year
At California rates ($0.30/kWh): $62 per year

For comparison, a refrigerator uses about 400 kWh per year. A window AC used a few hours per day in summer can hit 800 kWh. Even on California rates, the 3D printer is cheaper to run than an old fridge.

When electricity does matter

Three scenarios where the cost adds up enough to notice:

Commercial print farm. 10 printers running 20 hours a day, 365 days a year, on California rates is $4,500/year. Material still dominates, but electricity becomes a line item worth tracking.
Heated enclosure or chamber. Holding a 40°C chamber can easily double the total per-print energy.
You're comparing total cost vs. buying prints. Even then, electricity is usually under 5% of the all-in per-print cost. Filament dominates.

Frequently asked

Will a 3D printer add a lot to my power bill?: Almost certainly not. At 100W average draw for 40 hours per week, that's 208 kWh per year. At US average rates, $37 per year. At expensive rates like California, $73. Compared to a refrigerator (400 kWh/year) or central AC (2000+ kWh/year), a 3D printer is a rounding error.
Does leaving the printer on between prints cost much?: No. Most modern printers idle at 5 to 15W (controller, screen, optional fans). At 10W idle for 24 hours, that's 0.24 kWh, about 4 cents at US average rates. Over a year of idling, maybe $15 to $25.
What about a heated chamber?: This is where draw gets meaningful. A heated chamber can pull 200 to 400W when active, and some run continuously. A chamber held at 40°C for a 12-hour print can easily double the total print energy. Budget accordingly if you have one.
Are newer printers more efficient?: Slightly. Modern printers like Bambu's lineup and Prusa's MK4 use silent steppers, better thermal insulation on the bed, and PID temperature control, which all reduce average draw. A 2020 Ender 3 averages around 125W during active printing. A 2024 Bambu P1S averages closer to 95W. Small improvement, real but not transformative.
How do I measure my actual printer wattage?: A Kill A Watt or similar wattage meter plugs into your outlet and reads real-time draw. Under $25 on Amazon, lasts forever, useful for measuring any appliance. Plug the printer into it, print something representative, check the kWh readout at the end.