Anyone got any suggestions for 300x300mm (12"x12") heated beds? I’ve seen some Silicone ones but they were pretty pricey, Is anyone making a prusa PCB version with those sort of dimensions?
Hmmm, I was considering a high impedance wire set in some high temperature silicone. I’ll put aluminum and glass on top. Would prefer something off the shelf though - less likely to burn the house down!
If you look up ‘flexible silicone-rubber heat sheets’ at McMaster.com you’ll find a 12x12 without adhesive for 70 bucks. It’s a/c so you’ll need to add an external relay, but these suckers get hot fast. I believe @ThantiK uses this and used a high temp silicone adhesive to attach to bed. Not sure if this is what you considered pricey, but that is a pretty large heater, so you’re paying for it. Once I get some other upgrades completed, in going to add one of these. I’ve dumped 15vdc into my current heater and can’t get higher than 80C, as it’s 2ohm resistance and I’m not getting close to my max power on my PS. Any higher voltage would make me need to fiddle with my electronics, so I’m looking to go a/c on the heater. Good luck
Thanks folks. I’ve found 2 candidates. Trinty labs do a 12" kapton heater for $40 but they are sold out. I also found a Chinese supplier that will do 300x300 12v silicone heat pads for $20 including shipping. I think i’ll take a punt on the Chinese option and post my findings.
Make sure you get the resistance rating so you know how much voltage and current are required. At 12 volts, you’re going to need high current and some beefy wires. Good luck
@Eric_Moy the nice lady from China has asked me to spec Max temp and current and they’ll stick some high temp leads on in the factory. I’ve told her 20amps 
good job I’ve got a spare 300w PSU.