lately I finished my heated bed.
Used mirror on top of heating PCB (5mm, 220x220).
I simple mirrored acrylic bed wholes on aluminum sheet (4mm, 250x250) then printed holders for glass+heating PCB with mounting for aluminum.
Max would be 120 I think (ABS 110 around)...
For the heater I'm going to use a silicon heater, you can search " Reprap 215*215mm 12V 100W Silicone Heater 3D Printer Prusa Mendel Self-adhesive" in ebay to find it.
And for the dimensions of the bed, I have done a DXF to ask for a quotation on how much does it cost to laser-cut it in a 5mm aluminium plate. You can find my drawings in
The acrylic bed is a bit bigger than in my drawing (maybe 1.5mm bigger) but the mounting holes dimensions are accurate (I hope!).
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