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thickness of calibration card

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You can use a regular piece o paper and it should be fine. Alternately, you can level the bed by eye. I usually level to the point where the nozzle is just touching it's reflection, and then back it off slightly. I like leveling by eye rather than with the card because if you're using a card or sheet of paper, you could accidentally put extra pressure on the bed and throw off the leveling process.


What model printer do you have? 

If it's a UM2 series printer, you want the springs about medium tight (too loose can cause issues with bed stability).

If it's an UM3 series printer, you want the front of the metal heated plate about level with the lip at the front of the base plate. If it's too high, your active leveling won't work.

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0.15 mm.


You can also buy some calibration things online. Bought one made of metal, selected it by mistake when buying spools, pretty useful in the end because the edges of the metal won't fold or get indents if you hit it against something by mistake, like the core or anything else, contrary to the paper calibration card.

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