Hilly Billy Heated Build Platform
thingiverse
To create a homemade heated build platform, use a dual-sided copper clad board cleaned with acetone and steel wool. Draw a serpentine pattern on one side using a Sharpie and cover the backside completely with paint or another Sharpie layer. Etch the board for 40-70 minutes, remove Sharpie marks with acetone, and measure resistance. Adjust resistance to around 4 ohms by shorting out serpentine legs evenly spaced. Attach a 100k ohm thermistor and a 5k ohm resistor in series for temperature sensing, connect to the extruder controller, and calibrate the temperature circuit.
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