Prusa i3 captured nut heat bed positioner

thingiverse

All you have to do is insert your block onto the heated base, attach it securely using the heatbed support's built-in arm clamp, and reconnect everything. To properly level your bed, loosen the retaining nut located at the bottom, raise or lower the support table by turning the leveling screw, then re-tighten the nut to secure it in position.