Just an FYI. I received a replacement heat bed but it was slightly more warped than my current bed. So I decided to take it apart to see if anything could be done to help flaten it. On disassembly, I see the heat bed assembly is made up of a 2mm (flexible) magnetic sheet and a 3mm aluminum plate (with laminated heater sheet).
The aluminum plate determines the flatness of the bed. The plastic frame is not rigid enough to effect the Al plate. And hand flexing the plate did not help. Machining the aluminum plate does not appear to be practical.
Here are photos of the components.
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Laminated as in glued to the aluminum sheet? Or is the pcb heater just screwed to it?
Laminated to the plate. The heater sheet can not be separated from the aluminum plate.
how thick is the pcb heater and aluminum plate sandwich? or is it one of those aluminum pcb heaters without a dedicarted aluminum plate since the aluminum is the substrate of the pcb ? ive ordered myself a milled one, without any instructions. i havent received the plate yet and just question how to reuse the pcb heater of the printer. do you have a front and back picture of the heater? or one which shows its sides?
The total thickness of the aluminum plate and heater was 3mm. I would guess 80+% was the aluminum plate. Unfortunately I threw all of it out.
ok, just in case im missing something, the heatbed is constructed this way:
magnetic mat
aluminum plate with the heater laminated to it.
plastic tray
triangular sheet metal frame
You’ve got it right.
Please, let us know how you make out with the new plate.