PCB Heatbead Mk1

thingiverse

The heatbed has been thoroughly tested and is ready to ensure perfectly flat prints. After much development and testing work, you can find more background information in a previous version here: http://www.thingiverse.com/thing:2172. The active heated area measures 20x20cm, with an overall size of 214x214mm, making it compatible with Mendel and various other RepStraps - just check if it fits your bed. Double-sided for increased rigidity, it won't damage the heating element even if wrong Z offset is set (thanks Joaz for this idea). Powered by 12V, the prototype draws 9.9A when cold and 7.5A when hot, with isolation on the bottom of the heater reaching 100°C in about 4.5 minutes. The ratings may vary slightly on each PCB, and it can be easily converted to use 24V or 48V. RepRapSource has agreed to fabricate these beds professionally, available at http://reprapsource.com/en/show/6403, made in Germany. For DIY etching, a 35um copper layer is required with all traces perfectly same; otherwise, it may generate more heat and burn the board. Copper must be covered before heating to prevent corrosion. Mounting options include using 3mm holes in the corners for screws, standoffs, and insulation, or utilizing magnets as shown here: http://prusadjs.cz/2010/04/heatbed-mk4-we-are-almost-there-simple-cheap-hot-swap/. Plywood or a similar material is recommended as the base, as acrylic may warp. To prepare for printing, simply top some kapton/pet tape on the printing side.