Ultimaker UM2 Assembly Manual page 6

5. Take 35x M3 square nuts and place
them in the T-slots of the front-back, top
and bottom plate. use pliers or tweezers
to make sure the nuts are fitted correctly
in the frame
6.
Attaching the 3 end-
stops with 6x M3X12MM
(firm but not excessive
torque!
7. Red Endstop on the left
plate (that's plate with
the extra motor holes).
make sure the lip is facing
upwards (check photo)
6