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

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13.9 F.I.N.D.A. does not detect the absence of the filament
F.I.N.D.A. sensor is located on the top of the selector. Please check out the picture
1.
During the printing process, the filament can be pulled completely out of the MMU2S unit
(away from the pulleys), so during the next filament load, the gears are unable to grab the
filament string.
This happens when the sensor (FINDA) does not detect the end of the filament and the unit
is still trying to unload the filament, so it moves the string too far.
This problem is caused by improper detection of a filament string in the selector. It’s very
likely that there are filament pieces under the F.I.N.D.A. sensor, so the metal ball can't move
freely.
Solution ​ :
1. Unscrew the Festo fitting on the MMU2S side.
2. Use compressed air to blow out the filament dust in the area under F.I.N.D.A.
sensor.
3. Check the correct functioning of F.I.N.D.A. sensor - open
​
LCD menu - Support -
Sensor info
​
. If there is no filament below the sensor, the F.I.N.D.A. will show value
“0”. Insert a piece of filament from the front through the selector and the value must
change to “1”.
13.10 Pulleys covered with filament dust
Dirty pulleys cause the filament to slip, resulting in problems with insertion and ejection of
the filament. The best practice is to clean the pulleys with an acupuncture needle, mini-brush
or a similar tool.
When the filament is grinded away by the pulleys excessively, it can be caused by:
1. Lack of idler pressure - Tighten spring bolts, so they are about 0.1 - 0.4 mm
(max 0.8 mm) below the MMU2S body level.
2. Excessive bending of PTFE tubes causes excessive resistance when moving
the filament.
Check whether the idler springs are correctly tightened.
If the idler springs are overtightened, it may cause the idler motor to skip and then the
correct filament is not pushed against the selector position. Insufficient tightening causes
clogging of the pulleys. The screw head should be tightened just enough, so it’s position is
about
​
0.1 mm to 0.4 mm below the body level
​
of the MMU2S unit.
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