FYI Tightening the extruder tension spring to tight can have the opposite effect that

3D Printing
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1

FYI

Tightening the extruder tension spring to tight can have the opposite effect that you are trying to achieve.

ie: to gain more tension on the filament to stop filament skipping.

This has caused me a day to track this simple problem down. Adjusted - adjusted the stepper current, dissemble the nozzle looking for a partial plug, bang head on work bench. I do not suggest the later.

Tightening the tension to much must flatten the filament out causing less bite, i guess.

2

Over-flattened filament will also resist entering the barrel. Pressing it too thin on one axis makes it too wide on the other.

3

I’ve noticed some people’s hobbled bolts and idle bearings are flat, the ones I’ve got have grooves to curve around the filament. The hobbled bolt will slip if not very tight though, I’ve tried all different levels of tightness!

4

Yes the drive hobbled or what ever it is called on a direct drive system is curved, not flat. The bearing of course is flat, i think @Whosa_whatsis hit the cause. If the filament is to far smashed then it can become wider that the barrel. Makes sense, when i tighten the screw the problem became worse. When i loosened the screw it became better. Just need to find that sweet spot in between to much and not enough.

5

I mean the bearing can have a groove in it like this, to stop it flattening the filament http://item.mobileweb.ebay.co.uk/viewitem?sbk=1&nav=SEARCH&itemId=310776628252

6

Ah gotcha. Sorry i didn’t catch that first time. Have you tried one?

7

I had a derp moment when I kept tightening my filament tension but had slippage every revolution of my filament gear. I finally refluxed that the set screw on the great was too long and was colliding with the bearing pushing the bearing away each revolution. Replaced with a smaller set screw, and viola

8

For what ever reason this has just started. Might be because the PEEK moved up 1/2 mm or less so that it wouldn’t go back into the jigsaw. I filed the PEEK down flush. I tested it with filament before reassembly, but must be just enough smaller now that it is making the difference. I now think i should have checked it with a caliper.