Huxley PCB Heatbed
PCB used as heater for build surface. Enables printing of large objects without warping.
The board is designed to fit a standard RepRap Huxley build area, so 140x140mm. This design can be used with a bed mounted Mosfet circuit, allowing the power circuit to by-pass the main electronics, or driven directly from a Mosfet on-board the electronics.
Thermistor is surface mount. The board has been designed to be mounted upside down, sandwiched between an Aluminium build surface and a thermal insulator (such as balsa plywood) underneath. The thermistor sits in a counterbore, so that it measures more directly the temperature of the build surface.
There is also a probing circuit running around the outer perimeter of the board. Contact is made by the heads of the mounting screws (which are spring loaded), three of which are placed in series. This could potentially be used for auto levelling, as well as (crudely) digitising object.
An on-board LED indicates when the heater is powered.
Where to get it
Coming soon to eMAKERshop
Also available on Thingibox
Oven reflow technique.
Look to the RepRapPro_Huxley_heatbed_assembly to see how to mount the bed on the reprap.
And RepRapPro_Huxley_wiring#Step_7:_Heated_bed_signal_wires for the wiring.