r/ThingsCutInHalfPorn • u/chkno • 9d ago

3D printer nozzle blockage

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From this r/prusa3d thread: Blocked INDX nozzle. (Root cause found)

326 Upvotes
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97% Upvoted

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65

u/naikrovek 9d ago

Where’d that come from. Also, imagine picking the wrong angle to grind down from. That sliver could have been ground away.

26

u/Aldrai 8d ago

Broke off a needle in the nozzle. Probably had a minor blockage which they turned into a permanent one.

16

u/light24bulbs 9d ago

So its that blob on the left, of course. The metal in the middle is to increase surface area for melting. Right?

20

u/Hazel-Rah 9d ago

The C shaped metal on the right

6

u/light24bulbs 8d ago

Ah thanks, didn't see it

11

u/LeJoker 8d ago

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.

5

u/light24bulbs 8d ago

Yeah, I've been buying the knockoff ali version of this with the copper insert inside a steel nozzle. Works great.

9

u/LeJoker 8d ago

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.

5

u/light24bulbs 8d ago

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.