Re: Extruder Drive Gear Slipping on Filament
Seems like the issue, for me at least, is if I start the print and the z-distance is not correct, it's too close, and then it struggles to extrude and over time it becomes worse. Although it might look OK to begin with, but after some time you'll see it leaving gaps in the print.
My fix was to heat the nozzle to 250 and make sure all the filament went through smoothly, and restart the print and make the z-adjustments absolutely perfect – seems to work now.
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Original Prusa i3 MK2
Re: Extruder Drive Gear Slipping on Filament
I am way late to this topic but wanted to add a thought for those of us late bloomers....
Any chance you are to tight on the idler and are thus consuming to much motor torque in the idler and (more so) the motor bearings. This would explain your nice video showing a pristinely clean drive gear and yet the 'slipping' or more accurately the gaps in plastic output. If this hypothesis were correct you would actually be slipping in the stepper motor magnetic driving. I would ask you try either lowering the idler tension or increasing the stepper drive current. I do like your modest success with being carefull with the Z height and speed but it sounds like it is not a robust change yet. 🙂
Re: Extruder Drive Gear Slipping on Filament
I am having this same issue.
My extruder grabs and loads a large portion of the filament fine but once it starts small revolutions it pretty much only skips.
I have tried all combinations of loose/tight idler springs.
The only other thing I can think of is that for some reason the current to my motor is much too low for whatever reason...
How would I go about changing my extruder motor current?
Not much else I can try at this point besides buying an entire different extrusion design such as the titan.
Re: Extruder Drive Gear Slipping on Filament
How would I go about changing my extruder motor current?
The only simple way I know is silent mode vs. hi-power mode.
So the motor is trying to turn but can't? (As opposed to the motor turning but the hobbed pulley slipping on the filament).
If that's the case the other thing that comes to mind is that the filament can't be pushed through the nozzle as easily as it should be. Possible causes include clogs in the nozzle or farther up, like in the PTFE tube, or the nozzle isn't as hot as it needs to be to sufficiently melt whatever filament you're using.
-Ticc
Re: Extruder Drive Gear Slipping on Filament
How would I go about changing my extruder motor current?
The only simple way I know is silent mode vs. hi-power mode.
So the motor is trying to turn but can't? (As opposed to the motor turning but the hobbed pulley slipping on the filament).
If that's the case the other thing that comes to mind is that the filament can't be pushed through the nozzle as easily as it should be. Possible causes include clogs in the nozzle or farther up, like in the PTFE tube, or the nozzle isn't as hot as it needs to be to sufficiently melt whatever filament you're using.
-Ticc
Oh I when you mentioned silent mode I was excited to try that out because I did see it has been on silent mode this whole time, I never tried it on high power mode, and that could be the whole reason.
But I got back to try it and to no avail.
Here is a video of whats happening and how it successfully loads the filament but then just starts skipping.
If it just kept running at the rate during loading the filament except slightly slower it would totally work.... so I imagine this could be fixed with software
Re: Extruder Drive Gear Slipping on Filament
Wow, this topic is so important it should be on the top list. This was my main problem since weeks!! Tried everything, but this is the thing that made my print sucked everytime.
Re: Extruder Drive Gear Slipping on Filament
Mine finally works! There was two things wrong. Firstly my extruder fan was actually hooked up to the print fan connection so it wasn't coming on at the right moment. It would come on every now and again so I must have missed it not coming on at the right time 😳 , it should come on right at 50 degrees.
I also bought a acupuncture needle (the only needle that I could actually get into the nozzle) .
So make sure your extruder fan is working properly and is not plugged into the print fan connection.
Re: Extruder Drive Gear Slipping on Filament
super late to the game, but here is what I suggest everyone check first when they are having issues with filament being fed. first, if you can manually push and pull the filament into a hotend with little issue, then the simplest issue may be a loose/lost tiny screw that holds the gear to the shaft of your extuder motor. fixing this will not require anything but inspecting that the itty bity screw is still holding the bondtech bits alligned on the drive shaft
this was a reason for a blob rock failure last night, and excuse for me to do troubleshooting and r3 upgrade
these guys...see the tiny hole for the screw
and we’ll be saying a big hello to all intelligent life forms everywhere … and to everyone else out there, the secret is to bang the rocks together, guys.
RE: Extruder Drive Gear Slipping on Filament
Hello together,
i also have issues with the extruder Gear that is slipping or more likely flicking back.
I recorded it. Any ideas? Just startet out of nothing.
Results are, in best cases, no filament on the bed.
I appreciate any comment.
RE: Extruder Drive Gear Slipping on Filament
Hello again,
i found now some information about the PTFE tube that could be damaged.
I disassembled the head now and took out the tube. It isn't burned, but some how not round anymore. I hope this causes the problem and will be solved after replacing it.
Here is a picture of it:
I ordered now spare parts. Tube, a new nozzle, and a new gear just in case.