Prusa Research i3 MK3S+, Manual

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2. Y-axis assembly
26 Original Prusa i3 MK3S+ kit assembly
STEP 21 Installing bearings on the Y-carriage
Insert linear bearing in the cutout.
Place the bearing clip over the bearing.
Insert two M3x12 screws into the holes in the bearing clip.
Hold by your fingers the heads of both screws and turn the Y-carriage. Place the
nyloc nuts on both screws.
Use the 2.5 mm Allen key and needle-nose pliers and tighten both nuts.
Repeat these steps for the remaining two linear bearings.
STEP 22 Inserting smooth rods into Y-carriage
Take all the smooth rods and compare their lengths. For Y-carriage you need mid-
sized rods (330 mm).
NOW, PLEASE BE VERY CAREFUL! Gently insert the rod straight into the
bearings, do not apply too much force and do not tilt the rod!
If you can't slide the smooth rod easily, check the two bearings are aligned properly.
In case you manage to push out balls from the bearings, please count them. One or
two balls are ok, if there are more of them, please consider ordering new bearings.