D-Bot heated bed jack
thingiverse
Simple jack for "thin" beds, mine is concave in the middle, with this I can level it. Apply thermal insulation on the "pad" part (cork, neoprene). Insert an M5 nut and its screw on the "jack" part. Use a pair of 8 mm rigid pipes/rods. Place the supports with t-nuts and screws. I strongly discourage the use of pla, at least for "pad" part.
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