Prusa Research i3 MK2.5S Multi Material Upgrade 2S, Руководство пользователя

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The selector motor isn’t working
​
- first, try powering the printer off and moving the selector
by hand. If that didn’t help or you were unable to move the selector, release the three screws
holding the selector motor in place, pull the motor out. Then push the smooth rods out with
an Allen key. You can now easily remove the selector. Clean the stuck filament and release
three screws holding the selector motor in place, pull the motor out and try pressing the left
and right control buttons. See if the motor’s shaft rotates. If not, the motor may be defective,
or it is plugged in incorrectly.
The selector blade is loose
​ - if you haven’t secured the blade properly during assembly, it
may fall out of the socket and block the movement of the selector. Release the three screws
holding the selector motor in place and pull the motor out. Then pull both smooth rods out.
Place the blade back in place and tighten it properly. Then reassemble the unit back to the
original state.
Filament is bent and stuck in the selector ​ - release the three screws holding the selector
motor and pull the motor out. Then pull both smooth rods out (use the Allen key) and remove
the selector head. Remove the broken filament string from the selector and reassemble the
unit.
13.6 Loud clicking and idler unable to move freely
Clicking during the initialization sequence (homing) after switching on is a common
part of the initialization process. This is not a problem and is unrelated to this case.
If the printer makes a loud clicking noise as the selector changes positions, and you see that
the idler was unable to rotate into the correct position, it’s a different case. See the following
points for more information:
1. The idler springs are excessively tightened. Try loosening the screws at the edges of
the MMU2S unit as shown below. The correct tightening of the springs is 0.1 mm to
0.4 mm (max. 0.8 mm) below the body level of the MMU2S unit - see Pict. 36.
How to verify the correct tightening of the springs?
​
Load all five filaments
into the MMU2S unit.
​
Move the selector up to the right position and back
again using the right and left buttons on the MMU2S unit. If you still hear a
clicking noise, loosen the screws even more and check again.
2. If the idler is still getting stuck, turn the printer off and open the MMU2S completely,
then make sure that the idler is moving freely.
3. Check that the idler is tightened against the flat part of the motor shaft by two M3x10
screws and does not slip when the motor rotates.
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