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How to level the bed of a Prusa i3 MK3S 3D printer using 3D printed TPU rings

How to level the bed of a Prusa i3 MK3S 3D printer using 3D printed TPU rings, so You can get the perfect first layer
 

How to level the bed of a Prusa i3 MK3S 3D printer using 3D printed TPU rings, so You can get the perfect first layer