Prusa Research i3 MK3S+, Manual

Page: 81 / 144

5. E-axis assembly
Original Prusa i3 MK3S+ kit assembly 81
STEP 54 Fine tuning the x-axis belt
In this step, we will finish tensioning the belt. Please read the instructions first, your
belt might have proper tension already, then there is no need for additional screw
adjustment.
First, slightly release all the screws holding the motor, otherwise, the "tensioner"
won't work (the motor must be able to move).
Using ball-end Allen key start tightening the screw on the rear side of the X-end-
motor, but after each turn or two check the tension in the belt.
For the optimal performance, the belt must be a bit harder to press with your
fingers. Move the extruder all the way to the X-end-idler and try the belt tension in
the middle of the X-axis.
When you achieve optimal tension, please tighten the screws again.
In case you experience X-axis failure during calibration or skipped layers in the X
direction, you can adjust this screw accordingly. Tightening the screw stretches the
belt. Releasing the screw has opposite effect. Each time don't forget to release the
screws on the motor first.
STEP 55 Nylon guide parts preparation
It is recommended to wear safety glasses while cutting the nylon filament.
For the following steps, please prepare:
Black nylon filament 50 cm / 19.7 inch (1x)
The black nylon filament is included in the MK3S Fasteners & ELE package.
Using the pliers cut one end of the filament to create a tip.
Check the tip is similar to the third picture.