Prusa Original Prusa i3 MK2, Handbook

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12 FAQ ‐ common issues when assembling the printer kit
12.1 Nozzle/print surface gap is greater in the middle than at the
corners
The reason of this issue isn’t the bent printer surface or bed but a distorted Y­axis. We
suggest to remove the whole Y­axis out of the
​ printer ​ . Follow these steps:
● Align the Y­axis so that each Y­corner is sitting on the table ­ none should be off the
table.
● Align the tightening of each Y­axis threaded rod so that each Y­corner is
perpendicular (facing upright) to the table surface.
● Align the tightening of each Y­axis threaded rod so that each M8 threaded rod is at a
right angle to the M10 threaded rods ­ the Y­axis must form a perfect rectangle when
viewed from above (
​ pict ​ . 30).
Pict. 30 ­ Right angle between Y­axis and M8 / M10 rods
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