This is my own PCB heatbed design. It supports both 12V and 24V power systems, making it a flexible solution to any 3D printer design which calls for a 20cm x 30cm print area.
The rear edge of the board has been extended in order to make it easier and more reliable to connect to. Slots at the rear of the board are meant to zip-ties to secure power wires (see example photo of assembled unit). The bed can be used with either 12V or 24V power supplies by selectively jumpering the points labeled on the board. In 12V systems, the board will draw approximately 9A (110W), which makes it suitable for use with most reprap control boards. There is a mounting hole for a traditional thermistor to be taped to the back side of the board, as well as pads for a 0603 SMT thermistor if you wish.
The mounting holes at each corner are meant for M3 screws (or 4-40 SAE) and are 209mm along the short edge. The two front corner holes are slotted so that the long edge can be mounted to beds from 309 to 312mm.
Thermistor: Choose this to have a SMT0603 thermistor (100K, B=3950, Mfg. Part Number CMFA3950104JNT) pre installed.
Wood platform: The wood mounting platform is laser cut from 6mm plywood (either birch or maple laminated). The four interior mounting holes in the wood deck are meant to align with the Wilson II Y table (https://github.com/mjrice/Wilson2/blob/master/stl/y-table-10.stl)
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I am an Electrical Engineer, programmer, and designer of things including the Reprap Wilson.
My YouTube channel is https://www.youtube.com/channel/UCx-egISa3KL49R-BvAkR9kA