My previous heated bed was nichrome wire based, I counldn't get it above 60°C, so it wasn't usable for ABS, but worked great for PLA. It started out as an experiment, and through various hacks I kept it working. Finally, coming up to another necessary repair I decided to build a new bed. I bought some Ceramic wirewound resistors from Digikey, fireproof, I'm paranoid. I'm first trying to attach them to the same aluminum plate with JB-Weld. I needed a small putty knife to apply the jb-weld to small ceramic blocks, so a couple lines of openscad later:
cube([50,10,1], center = true);
translate([15,0,0])cube([30,15,1], center = true);
I have a putty knife the exact size. For now, I'm just waiting for the jb-weld to dry. If the jb-weld doesn't hold for the comparatively low temperatures needed for a heated bed... well I'll have to figure something else out...
the putty knife is on thingiverse now