After breaking two acrylic build surfaces on my Cupcake CNC I ran out of options for materials to build on. I have an Automated Build Platform but I am printing big parts so I needed a regular sized build platform. I thought for a while and I realized that I could steal my heater board from my ABP, cover it in Kapton Tape, then mount it on the wooden magnetic build platform. It works great now. In the photo there is a part I printed using this technique. The picture doesn't really do it justice though. The bottom of the part came out so smooth. I would recommend this for those of you without an acrylic build surface.