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I can't defeat the under-extrusion of my MINI+  

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MikeAH
(@mikeah)
Active Member
I can't defeat the under-extrusion of my MINI+

Hi all,

I've been running into a ton of extrusion issues with my Prusa MINI+ lately. I previously was using the Prusa MINI Internal Filament Sensor (IFS) from Printables and I really liked it, but in recent weeks it's been under-extruding after a bit of printing and filament skips on the extruder gears. I tried reprinting the IFS mod just in-case tolerances were off with my MK3S+, but kept running into the same issues when I'd print on my MINI+. I then tried a cold pull on the MINI+ 2 times and kept running into the same issue.

Eventually, I figured I'd give the Bondtech IFS Extruder upgrade a try. Off the start, it was printing flawlessly and quietly with a Benchy bottom. Then I decided to throw a full Benchy print at it with some Printed Solid PLA Yellow Bird filament (Prusament PLA 0.15 profile in Prusaslicer 2.5.0). It made it a few layers in and then I noticed I heard clicking from the extruder and under-extrusion on the print.

At this point I'm wondering why it's under-extruding or clogging. The nozzle seems fine since it's printing fine for the first few layers and then it's running into issues (seemingly). I've attached a photo of what it looks like as it starts to print the floor of the Benchy model.

Thanks in advance and hoping I just missed something simple that might be causing the extrusion issues.

Posted : 07/10/2022 2:49 pm
fuchsr
(@fuchsr)
Famed Member
RE: I can't defeat the under-extrusion of my MINI+

There are only so many points in the filament path that can cause underextrusion (assuming you're printing at the right temperature for your filament). You've looked at most. I didn't see mention of the PTGE tube in the hotend, or a physical obstruction caused by the way the spool feeds the filament to the printer. 

Posted : 07/10/2022 4:00 pm
MikeAH
(@mikeah)
Active Member
Topic starter answered:
RE:

 

Posted by: @fuchsr

There are only so many points in the filament path that can cause underextrusion (assuming you're printing at the right temperature for your filament). You've looked at most. I didn't see mention of the PTGE tube in the hotend, or a physical obstruction caused by the way the spool feeds the filament to the printer. 

I checked the PTFE tube going from the extruder to the hotend, no blockage or debris inside of it. I also reseated both ends of the tube to no avail.

Doing a manual push via the hotend with the PTFE tube off I can manually push it through just fine without a ton of resistance it seems (once heated).

I just did 2 cold pulls in a row and now I can seem to actually print without under-extrusion, I'm wondering if there was some residual debris in the hotend that I didn't pull in a prior cold pull. Printing with the same PLA roll and it's happy.

Fingers crossed it stays printing flawlessly!

Posted : 07/10/2022 9:05 pm
fuchsr and liked
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