Prusa Research i3 MK3S+, Manual, Page: 79 / 144

5. E-axis assembly
Original Prusa i3 MK3S+ kit assembly 79
STEP 50 Tensioning the X-axis belt
Using right hand rotate the motor to its original position and hold it (tension is
applied to the belt).
Using two fingers on your left hand push the belt together. Very small force should
be needed for bending the belt, BUT the belt shouldn't be bent by its own weight
before being pressed with your fingers, it must be straight.
If you are struggling to rotate the motor back into position, the belt tension is too
high.
Depending on the belt being under or overstretched, adjust the amount of the belt
in the X-carriage.
When done, rotate the motor to its original position and tighten the M3 screws
again.
STEP 51 Aligning the X-axis belt
Both top and bottom part of the belt
should be parallel (above each
other).
To adjust the belt position, release
the screws on the pulley and move
it slightly until you reach the best
position.
Tighten both screws on the pulley.