Bondtech extruder stopped moving soon after install
 
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[Solved] Bondtech extruder stopped moving soon after install  

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WillDeed
(@willdeed)
Active Member
Bondtech extruder stopped moving soon after install

Hi all,

I upgraded a few things on my Prusa Mini this weekend, but I'm having issues with the new Bondtech extruder. I'm hoping I can get some troubleshooting advice.

What I upgraded:

  1. Mini+ Upgrade (replaced the MINDA with the Super PINDA)
  2. Bondtech Dual Drive Extrusion Upgrade
  3. Bondtech Heat-break Upgrade

 

The extruder upgrade was done according to the instructions:

  1. Swapped out the extruders, offsetting the new brass motor gear with a zip tie
  2. Swapped the red/blue pins on the connector to the main board
  3. Installed the thumb screw and backed it off by 4 turns
  4. Adjusted the estep by adding "M92 E415" to octoprint via Terminal and PrusaSlicer

 

I then started doing some z-level calibrations, and everything looked fine. However, during the second calibration print, the extruder stopped pushing the filament.

I tried:

  • unloading/loading filament
  • Restarting the printer
  • Reinserting/adjusting ptfe
  • Tightening/Loosening the thumb screw

 

None of these fixed the problem. I can manually push the filament through the extruder, and I can see the motor turning normally. The filament doesn't move at all though, which makes me think it's not engaging.

Has anybody else had this issue? Any ideas on what I can check?

The only thing I can think of is if maybe the motor gear wasn't tight enough and slipped? 

Thanks in advance for ideas.

Best Answer by fuchsr:

Haven't had that with any Bondtech extruder but if you can manually push it through it's not a clog, and you said the motor is running, so all that's left is two things:

Most likely, the gear is not properly installed on the motor. Check the set-screw. Make sure it's properly installed per step 19 in the instructions.  Tight against the FLAT side of the shaft. I guess it could also be installed in the wrong orientation, which I managed to do once (albeit on a Mk3S). 

Or the idler (thumb screw) is not tight enough. 

Beyond that, I don't see anything else that can be wrong. My money is on the set screw.

Posted : 07/09/2021 2:44 am
fuchsr
(@fuchsr)
Noble Member

Haven't had that with any Bondtech extruder but if you can manually push it through it's not a clog, and you said the motor is running, so all that's left is two things:

Most likely, the gear is not properly installed on the motor. Check the set-screw. Make sure it's properly installed per step 19 in the instructions.  Tight against the FLAT side of the shaft. I guess it could also be installed in the wrong orientation, which I managed to do once (albeit on a Mk3S). 

Or the idler (thumb screw) is not tight enough. 

Beyond that, I don't see anything else that can be wrong. My money is on the set screw.

Posted : 07/09/2021 11:34 am
WillDeed
(@willdeed)
Active Member
Topic starter answered:
Re:

Yep. It turned out to be the set screw. I missed that there is a flat face on the motor, so I must not have used it and it loosened up to where it was basically a bearing at that point.

 

Tightened it up and it's running smooth now. Thanks for the reply fuchsr!

Posted : 07/09/2021 5:58 pm
fuchsr
(@fuchsr)
Noble Member

Happy to help!

 

Posted : 07/09/2021 5:59 pm
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