Unresolved Extruder not extruding while printing

Hey guys! So after 6+ months running 5 R1+(s) in my shop. I have finally run across a problem I have yet to see so far.

Okay, so I paused the print for a filament swap and upon restarting the print I heard the all too familiar sound the the Hobb bolt grinding into the filament. My first thought was a jam. I re-paused it and after re-cutting and re-inserting the filament I turned the gear manually with my hand and to my great surprise it smoothly flowed through. My mind then went to the motor next. I then had it extrude 100mm via the control panel (not manual turning of the gear) and again it came out fine. At this point I assumed all was well. Restarted the print and AGAIN it just ground the gear into the PLA as if there was some jam. Why on earth would the motor extrude just fine using the control panel to turn the gearing and not when during an actual print. Very confused. Would love some help. Thanks!

Specs: PLA @ 210°C & standard R1+ hotend.

 

Yes to the oiler. Will reclean teeth when I get home....but if it was the teeth, why would it extrude fine when done via the controls tab and not while during an actual print? Bolt tension? Plz explain

 

Okay, done experimenting. Very odd results. Not the Bolt, functions fine. Here is how I replicate the problem. Feed the filament, prime it manually using the gear and all is well.....then simply stop feeding the filament for roughly 30 seconds and a clog will have formed. Very confused on this one. Any suggestions?

 

I believe it was, but I didn't observe any drop in temperature. Furthermore I've seen these shutdown when the temp of the hot end gets too low.

 

Dumb question this: how do you check if the teeth are clean? Just a visual inspection?

 

Your fan comment earlier made me start thinking the same thing. I'm currently stuck @ my day job (engineer by day, 3D print shop owner by night) and will definitely take a look at this when I get home. Thanks for the input!

 

To examine the hobbed bolt you unscrew both springed screws and open the tension wheel housing all the way open. Clean with a toothbrush or canned air or both. Turn with big gear so you get the whole bolt.