Mk3s filament sensor not working
So I installed my Mk3s upgrade parts last week and it's all been working flawlessly except for the filament sensor. Under the sensor panel it always shows 0 no matter what and I can't print unless I disable it. The magnets are installed properly and always repel. The arm can move freely as well as the steel ball. I'm not sure the issue
Re: Mk3s filament sensor not working
Have you tried the filament sensor calibration procedure?
Re: Mk3s filament sensor not working
Double check the connection to the board. If you accidentally installed to the top row, it will read zero. Make sure it is connected to the bottom row.
Re: Mk3s filament sensor not working
Have you tried the filament sensor calibration procedure?
I've been following this post because I'm having similar issues, how do I go about doing that?
Re: Mk3s filament sensor not working
In addition to making sure the sensor connector is in the bottom row, also make sure it is the right way around! Pay attention to the wire colors. (See purple arrow):
Re: Mk3s filament sensor not working
I just upgraded my MK3 to the MK3S extruder (No MMU) last night and have also been seeing similar problems. I've done a bit of troubleshooting but haven't been able to solve it. Here's what I've figured out:
Re: Mk3s filament sensor not working
Have you tried the filament sensor calibration procedure?
I've been following this post because I'm having similar issues, how do I go about doing that?
I believe it's part of the new manual. You can see the status of your sensor on LCD control. 0 is no filament 1 is filament . I have mine switching somewhere in the middle.
RE: Mk3s filament sensor not working
@keegan-m
It seems to me that the plastic piece that slides between the sensor on the chip when a filament is inserted is slightly too large.
I just had the same problem with the sensor and checked all connections, etc. which were correct.
The ball and magnet are working properly as well
It seems that the plastic part that moves between the sensor when a filament is inserted is slightly too large. If I replace the chip slightly off to the left (looking down when standing in front of the LCD display) from being seated correctly it will give the correct IR reading.
I believe it's a mechanical problem, not an electrical one.
RE: Mk3s filament sensor not working
I had the same problem,
Check this/these out:
https://help.prusa3d.com/en/article/ir-filament-sensor-troubleshooting-mk2-5s-mk3s_112226/
this one worked for me
https://www.prusaprinters.org/prints/8624-mk3s-ir-sensor-spacer-05-mm/files
MK3 updated to MK3S / mainly textured steel sheet (also have a smooth one) / PLA and PETG
RE: Mk3s filament sensor not working
and just to stress this out.
This is a design flaw!
At least on the upgrade instructions (form MK3 to MK3S) prusa could ask you to check for this before everything was assembled and include some spacers / shims....
MK3 updated to MK3S / mainly textured steel sheet (also have a smooth one) / PLA and PETG
RE: Mk3s filament sensor not working
@jorgemarmo
I must agree with you that this is a design flaw. Possibly the tolerances are simply too close and easily prevents the FS sensor from working correctly. When I first assembled my printer, it seemed to work. However, after my first filament change I noticed it no longer did. It always detected filament present. Intuitively I solved this by cutting a 0.2mm first layer test print and placing it as a shims under the sensor, this fixed it and it's been working ever since. So it was quite a small margin for me.
But shims are a bit too hacky to me. When I disassemble my extruder at some point, I'm going to try out this mod: Prusa MK3S Filament Sensor Lever Upgrade - Thingiverse. It's a slightly resized FS lever printed at higher detail.