Re: 15 min fix for jam free QU-BD
Posted: Mon Apr 15, 2013 3:54 pm
Mike
I didn't see anything at Enco that would have a long enough LOC (length of cut) to do the barrel. The longest I saw for 5/32" was 7/16" and the 4mm was the same. I have found some, but they are special order. I like keos idea of grinding the end of a extra drill bit square and using it.
codepunk
The purpose of the stainless barrel is for heat dissipation at the cold end. When I had a jam on the stock barrel that I polished, the mushroom was close to the cold end. It was caused by heat creeping up the tube (the common problem with the QU-BD). It never jammed when it was extruding with very little stopping between extrudings. I think with the PFTE liner, the melt zone stays close to the same place and the cold end is doing what it is suppose to do. I think the problem with peek over the stainless for the barrel is that when you run ABS with the higher temps, the PEEK will soften on you. I have seen where the peek has soften enough that the threads strip and come apart on some hotends.
Rodney
I didn't see anything at Enco that would have a long enough LOC (length of cut) to do the barrel. The longest I saw for 5/32" was 7/16" and the 4mm was the same. I have found some, but they are special order. I like keos idea of grinding the end of a extra drill bit square and using it.
codepunk
The purpose of the stainless barrel is for heat dissipation at the cold end. When I had a jam on the stock barrel that I polished, the mushroom was close to the cold end. It was caused by heat creeping up the tube (the common problem with the QU-BD). It never jammed when it was extruding with very little stopping between extrudings. I think with the PFTE liner, the melt zone stays close to the same place and the cold end is doing what it is suppose to do. I think the problem with peek over the stainless for the barrel is that when you run ABS with the higher temps, the PEEK will soften on you. I have seen where the peek has soften enough that the threads strip and come apart on some hotends.
Rodney