Is this going to be a PCB board or one of the higher powered rubber or kapton based ones?
I've been searching for ideas for a 250mm diamiter one for my delta. I looked at custom PCB costs and circular PCB's cost an absolute fortune (for a 250mm one it was around £60 for a very basic board). You've then also got the issue that something that size will take litterally hours to heat up if its only running at 12 or 24v via RAMPs for example. The kapton and rubber ones seem to be a lot cheaper. They run on mains voltage, which you can have ramps control via a relay.
I've been searching for ideas for a 250mm diamiter one for my delta. I looked at custom PCB costs and circular PCB's cost an absolute fortune (for a 250mm one it was around £60 for a very basic board). You've then also got the issue that something that size will take litterally hours to heat up if its only running at 12 or 24v via RAMPs for example. The kapton and rubber ones seem to be a lot cheaper. They run on mains voltage, which you can have ramps control via a relay.