Hi, thanks for the response.
1. I've already moved to Robert's feeder a few weeks back. It seems to be working well, but doesn't prevent the skipping problem, which seems to be purely a matter of torque on the motor.
2. The bowden tube seems fine to me. It mates well at both ends, and in any case I don't see why damage to the bowden tube would get worse during a print.
3. As I mentioned in my first post, while I was cleaning the print head using the atomic method, I didn't notice that the teflon (a.k.a. PTFE) part offered any obstruction. In any case I've only had the printer a few months and it has not been heavily used. I don't expect that it's seen more than 30 hours of use.
I was thinking more along the lines of slight overextrusion causing a backlog of filament inside the head, but I couldn't explain why that wouldn't just cause the filament to exit faster.
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cleven 4
As many issues it is probably the PTFE part located above the printer head. After long use it can deform slightly causing a restriction on the material :(. The second is the feeder itself. If the feeder is slipping it can chew into the material causing friction in the tubing/ptfe exacerbating the friction/problem. I noticed that this with me increased over the printing time as you have described.
1 Clean the feeder or try some of the secondary options posted on Youmagine,
2 Inspect the bowden tube for damage
3. Take apart the printer head and inspect the white PTFE part for inner roughness. You can possibly drill out the hole slightly increasing the ID to redress the tube profile. Ultimaker is now providing a glass filled PTFE which has slightly better properties compared to the original. If there is damage perhaps you can put in a ticket or just order a new one.
There are many posts about this extrusion problem, I posted some of my tests here http://umforum.ultimaker.com/index.php?/topic/7024-teflon-spacer-replacement/
Or maybe it is something totally different
Cheers,
Kris
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