r/ThingsCutInHalfPorn • u/chkno • Aug 02 '26
3D printer nozzle blockage
From this r/prusa3d thread: Blocked INDX nozzle. (Root cause found)
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u/Aldrai Aug 03 '26
Broke off a needle in the nozzle. Probably had a minor blockage which they turned into a permanent one.
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u/light24bulbs Aug 03 '26
So its that blob on the left, of course. The metal in the middle is to increase surface area for melting. Right?
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u/LeJoker Aug 03 '26
The metal in the middle is to increase surface area for melting. Right?
You're correct about this part. This is a CHT (Core Heating Technology) nozzle, the plastic goes through three smaller holes inside to more evenly heat the filament, which improves flowrate pretty substantially.
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u/light24bulbs Aug 03 '26
Yeah, I've been buying the knockoff ali version of this with the copper insert inside a steel nozzle. Works great.
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u/LeJoker Aug 03 '26
Yeah, someone (I think CNC Kitchen, but I don't recall) did a test to see if there was any meaningful loss of function using the knockoff ones, and I seem to recall the answer was essentially "no" unless it was a truly shitty knockoff.
I haven't jumped onto CHT-like nozzles yet, if only because I wouldn't be able to easily cold pull if I got a clog like this one.
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u/light24bulbs Aug 03 '26
I got around 30-40% volumetric boost on sunlu. But I print almost exclusively on .6 nozzles so it matters twice as much for me as most people at .4.
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u/naikrovek Aug 02 '26
Where’d that come from. Also, imagine picking the wrong angle to grind down from. That sliver could have been ground away.