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vichug123 / neuron-replicator

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Hot-end & extruder drive experience documentation. #10

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
I've built a few hot ends and a couple of extruder drives; I'll write down the 
experiences & difficulties I've hit on the matter when I'm back in.

Original issue reported on code.google.com by jono...@gmail.com on 15 Jan 2012 at 4:00

GoogleCodeExporter commented 8 years ago 
Probably nothing much to add beyond what was mentioned in the meeting: leaks 
are a big issue for much of the reprap-derived hot ends, especially because of 
PTFE as a low-friction liner. The usual result is that partially melted 
feedstock bulges into a plug at the boundary of the liner, and disrupts flow, 
especially when that region does not become warm enough early in a print to 
allow the plug to move; eventually the stress from that ruptures the liner and 
forms a visible leak.
Nichrome wire is a pain to use, and is possibly awkward to mass-produce but 
that's common knowledge. Failed nichrome has been a fairly common event with my 
particular setup. Cartridge heaters are nice for this purpose but somewhat 
expensive; we'd likely need them custom made for the resistance and size for a 
hot end.

Original comment by jono...@gmail.com on 3 Feb 2012 at 8:34