Prusa Research i3 MK3S+, Manual

Page: 38 / 144

3. X-axis assembly
38 Original Prusa i3 MK3S+ kit assembly
STEP 3 X-axis: x-end idler and motor holder
M3x30 screw (1x)
M3x18 screw (1x)
M3nN nyloc nut (1x)
M3nS nut (1x)
623h bearing with housing (1x)
STEP 4 X-axis: inserting linear bearings
Insert linear bearings into the printed parts (X-end-motor and X-end-idler) as
shown in the picture. Make sure the first bearing in each printed part is pushed all
the way down.
DON'T TRY TO PUSH the bearings from the other side. There is a rim (smaller
diameter of the hole).
First pair of bearings should be in line with the top surface on both X-ends.
Second pair of bearings should be seated on the rim (close to the lower surface) on
both X-ends.
You can press the bearings against the flat surface for easier insertion.
Place two bearings in a way that the inner balls of the second bearing are rotated
45° compared to the first. This way you will achieve greater contact with the
smooth rod. See the third picture for more details.