I have conducted various tests, using different materials, but the problem remains the same, the internal surfaces do not allow the filament to flow smoothly.
TPU will never pass through and even stiffer materials become blocked.
I do not know how to resolve this at present.
I spent all afternoon printing y-splitters for my ams ptfe tubes. i practically printed 80% of the shown Y-splitters on maker lab , could not get one to work 100% of the time, i was trying to use one with the fancy ptfe couplers and they ALL caught up at least 1% of the time, which to me is unacceptable as i dont want any hang ups. Well i opened this one and did not think much , very small and plain , so i printed it and by goerge 100% success rate ,i sat there sliding filament threw ptfe tubes for about 1 hour and not one hang up . absolutely brilliant design, simple light weight and no fancy ptfe connectors, i am happy ,thank you so much. PS i did have to hone the inside of the end of the ptfe tube so it made an inside chamfer so there is nothing for the filament to catch on , 100% success rate so far. 10 out of 10
sorry reply is so late I don't look at this section very often ,there's no stl files for the chamfer inside ,just get a fairly sharp knife and carefully chamfer the inside of the ptfe tube on one end. Be carefull not to slice right threw the ptfe tube ,just twist the knife slowly until u get a nice inside chamfer right up to outside edge of tubin, so there is no flat surface for filament to catch against . works brilliantly . I've used my ams unit for hundreds of hours without a single jamn,good luck with yours sir
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