Ultimaker UM2 Assembly Manual page 16

17. The next shaft that we are going to
assemble, is the axle of the back left.
18. Slide a 25 mm bushing around the axle, it
is followed by a pulley.
19. Place the timing belt attachted to the
front left axle around the pulley. Insert the
axle through the hanging slider block.
20.
This is followed by a pulley and ano-
ther 10mm slider block.
21.
Attach the timing belt on the right axle
of the pulley and insert the shaft through the
housing, so that it is flush with the frame
16