The hobbed/grooved bolt that actually feeds the filament through the extruder is slipping, causing uneven fill problems. Regardless how tightly the tension bolt is tightened. The tension bearing is properly lubricated, as well as the extruder gears. Not sure why, as the teeth in the bolt don’t appear worn out. Anyone know where to find a better replacement bolt? or know of a potential fix?
I am using a hobbed bolt like this:
Found one on ebay, along with a grooved bearing. Also, check your spool is not jammed and rotates freely - this is a possible reason for poor filament feeding.
I think it’s likely that you’re looking for the problem in the wrong place.
If the filament path is misaligned or obstructed, or the hotend temperature too low, then the feed force will be excessive.
With a properly calibrated hotend thermistor and clear path through the standard hotend, I was printing black PLA with the tension screw backed all the way out and wondering why the extrusion rate was a bit off!
[quote=“pitachilla”]I am using a hobbed bolt like this:
Found one on ebay, along with a grooved bearing. Also, check your spool is not jammed and rotates freely - this is a possible reason for poor filament feeding.[/quote]
Can you give me the address where I you founded that ?
Did you do some modification to adapt it on K8200 ?
Here is the link to ebay: http://www.ebay.com/itm/RepRap-Hobbed-bolt-Grooved-Bearing-Wade-Mendel-Huxlel-3D-Printer-Extruder-/311132168945?pt=LH_DefaultDomain_3&hash=item4870ec22f1. Yet, I don’t remeber what was the distance for groove (25 or 28 mm), you can measure it on the stock bolt.