Ultimaker UM2 Assembly Manual page 31

27. Remove any dirt into the milled hole in
the top plate and slide the axle all the way
to the top.
28. Make sure the shaft is flush with the
frame, if this does not work then check
whether there is debris in the opposite hole.
if not, use a wooden plate and a hammer to
gently tap it into place.
29.
Make sure the end is flush with the frame
30. Install the covers for the axes from the inside
of the housing. The notches fall into the milled
holes in the bottom plate. Fix it into place with
4xM3x10mm screws. There can't be any gap bet-
ween the black cover plate and the housing.
31