Ultimaker Heated Bed

thingiverse

This fits into the screwholes of the Ultimaker Z-carriage.http://www.youtube.com/watch?v=zAHgWbq04nk The glass can be mounted using the smaller holes, e.g. by some small wooden piezes having a 3.2mm hole. The glass plate should be 22x24 cm to fit in there. The sides will overhang, but I could not find larger double sided FR4 PCBs than 30x20cm. I also recommend to diagonally cut away the glass corner over the minx-miny corner, where the pcb has the dent, to have initial through-extrusion also with the glass. A 2cm hole in the glass would also be the possible if you don't have a second extruder.. The image is of the previous version, which cracked the glass. I will change the images asap. Instructions The PCB is to be milled on a CNC using a 20x30cm double sided FR4 PCB with the usual 0.35 micrometer copper thickness. The small dent on the left is to have still space to have a Joris-style extrusion at the minx-miny corner. On the bottom, you can mount a thermistor that goes into the central hole. You can add a smd-led with a (1k) smd transistor on the small patch between the top-sided connectors. It should have around 4-5 Ohms, depending on your milling. Thats a lot of current. You hence require a 24V 300W power supply. That will however be only safe to install if you know how to deal with 220V.