Good news everyone: Eventually everything came together, the PCBs, the electronic components, the machining of the plastic parts, and the writeup of the assembly instructions, so the beta testing phase will start soon, possibly by February, 15th 2016.

Update

The hardware kits are now available here!

The beta testing hardware kit

PCB (top)	parts and electronics
PCB (bottom)	shrinking tubes

About beta testing

In the beta testing phase, I'll give out 15 hardware prototype kits to interested beta testers. Beta testers are kindly asked for a contribution of 39 € (incl. SSR) or 32 € (w/o SSR) plus shipping to obtain a hardware kit. I know that's something you don't see when beta testing in the software world, so to smoothen things a little, beta testers will get a 50% discount on a PCB from the final production line of the heated beds.

Who can beta test?

You need to own a compatible 3D printer. Besides that, everybody with sufficient knowledge about mains voltage electrical wiring and mains voltage safety precautions can take part in the beta testing. However, you'll have to agree to a legal liability disclaimer that leaves you with the full responsibility of all your actions and all the outcomes when testing the prototype.

How to get in

You can now order the kit here.