Z Calibration Square

thingiverse

I use this model to verify Z calibration defaults. I have a square bed with 4 screws, one on each corner. I print this model and then inspect how it's printed during the first layer. - If you see filament lines, the nozzle is too far from the bed. Loosen the screw at that corner. - If the nozzle makes noise or gets clogged during the first layer, tighten the screw at that corner. - If the first layer is perfectly smooth, the calibration is correct. On my ANET A8 printer, I added an Anycubic glass to ensure the first layer adheres well.