- Stock: 94
- Model: Mk3 214x214
Model:
MK2B 12V / 24V
MK3 12V / 24V
MK3 220x220 12V / 24V
MK3 220x220 12V + Wires
ALU 220x280 12V
MK3 235x235 24V
MK3 235x235 24V + Wires
ALU 329x329 24V
MK3 400x400 24V
MK3 500x500 24V
214 × 214mm MK3 ALU heated bed based on the open RepRap architecture, with a 3mm aluminium core and a circuit selectable for 12 or 24V DC. Its classic format suits many Prusa i3, P3Steel, 3DSteel and other RepRap projects when the carriage, holes and electrical system match.
Four corner positions and a front centre hole allow three-point mounting to be considered where the carriage offers the same pattern. It is supplied without wiring or thermistor.
Specifications
| Dimensions | 214 × 214 × 3mm |
|---|---|
| Supply | 12 or 24V DC, according to connection |
| Mounting | Four corners and one front centre position |
| Circuit | One 35µm copper layer |
| Resistance reference | RepRap design: 1.4-1.6Ω at 12V and 5.0-5.4Ω at 24V; verify the unit |
| Declared maximum temperature | 180°C; not a recommended setpoint |
| Contents | 1 bed; wires and thermistor not included |
Dual-voltage connection
- 12V: pad 1 to positive, pads 2 and 3 to negative.
- 24V: pad 2 to positive and pad 3 to negative; pad 1 remains unused.
Always check the supplied board's silkscreen. The resistance ranges above belong to the reference MK3 ALU design and can reveal major wiring errors, but they do not replace measuring the supplied unit. Calculate actual current and power using I = V/R and P = V²/R.
Sensor, control and firmware
The bed provides a sensor position but no sensor is included. The wired 100K B3950 NTC thermistor is conditional on mounting, input, connector and firmware. Verify a plausible room-temperature reading and a smooth increase before enabling the heater.
For a confirmed B3950, use Marlin type 11 with a 4.7kΩ pull-up, Klipper Generic 3950, or the equivalent NTC/Beta definition in RepRapFirmware. Keep thermal protection active and tune PID with the final glass, PEI or insulation installed.
The bed output must handle the measured current with margin. Where this is not documented, a 12/24V external MOSFET may be used, while the supply, wiring and fuse are still sized for the actual load.
Mounting and surfaces
Install the black heater side underneath and the aluminium face towards the build surface. Add strain relief, avoid distorting the plate when tightening, and use lower insulation without electrical contact with tracks or pads.
The 214 × 214 × 3mm borosilicate glass matches the plan dimensions. Check clips, Z height, mass and travel, then recalibrate Z offset, first layer and thermal control.
Compatibility
Conditionally compatible with classic Prusa i3, P3Steel, 3DSteel, Anet A8 and other RepRap designs using a physical 214mm bed and matching pattern. It is not presented as a replacement for the Original Prusa MK3/MK3S/MK3S+, whose commercial “MK3” name refers to a different printer and heatbed, or for an Ender-3 with a 235 × 235mm physical platform.
