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MK3.5S+ and MMU3  

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Ricksey007
(@ricksey007)
Active Member
MK3.5S+ and MMU3

Just finished assy of the upgraded printer and MMU3 kit.  Everything went well during assembly, but I am now having trouble with the filement sensor.  It's readout is 1 when no filament is in place and 0 when filament is inserted.  I have tried many different things to correct this but nothing seems to work.  I have traced the sensor wiring to make sure nothing to reversed.  Is it possible the sensor is bad?  I am using the same sensor that was on the machine before the upgrade.

Posted : 07/04/2025 9:48 pm
coolgrey5
(@coolgrey5)
Active Member
RE: MK3.5S+ and MMU3

IIRC I had the same problem until I discovered that the software engineers changed the semantics.... 😞 it changed from something like "is there filament yes/no" to "does filament need loading yes/no" (or something along those lines!!) hence why it appears reversed..... 🙃 

Posted : 08/04/2025 9:04 am
Ricksey007
(@ricksey007)
Active Member
Topic starter answered:
RE: MK3.5S+ and MMU3

This has been a great help.  I will proceed with recalibration and see what it does.  Thank you.

Posted : 08/04/2025 11:36 am
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