Blocked nozzle I have a Tevo Tarantula with a Bowden extruder and am finding that the filament is getting blocked frequently. I thought it might be a problem with the nozzle, but I fitted a new one and the same thing is happening. I have set the extruder temp to 240 degrees. https://reprap.org/forum/read.php?4,856448,856448#msg-856448 Mon, 15 Jun 2026 04:04:58 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,856448,857102#msg-857102 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,857102#msg-857102
PLA tends to carbonize and clog the tip if left hot too long without flowing. The hotter the lest time it takes and 240C is too hot for PLA. I use 200C for PLA and 240 for ABS.]]> pvwebb Reprappers Fri, 26 Jul 2019 21:51:12 -0400 https://reprap.org/forum/read.php?4,856448,857097#msg-857097 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,857097#msg-857097
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tmccar
I tried printing at 210 degrees but it's still getting blocked.

When I have run 240 degrees on hotends that are NOT all-metal, it frequently bungs up the PTFE liner in the heat break, and I replace the heat break, if possible with an all-metal one. This has happened to me with three printers, including my Tevo Tarantula. On the latter I replaced the hot-end with an E3D Chimera dual-filament Chinese knock-off. The Chimera has all-metal heat breaks. Take your hot-end apart and examine the liner, if it is all wrinkled up (mine always were) then replace the heat break and you'll be back in business. Take off the nozzle and look into the heat break. You will see a white liner in there, that is the thing to examine for heat damage.

I think that frequently our hot ends are running hotter than we think. Since we can't zap the heater block with a non-contact IR temperature measurement, we never know for sure... Frequently you can get a nearly exact heat break for your hot-end that is "all metal". It may not be perfect, but you'll never get clogs again due to a deformed PTFE liner in the heat break again!

DLC]]> dlc60 Reprappers Fri, 26 Jul 2019 18:08:55 -0400 https://reprap.org/forum/read.php?4,856448,857054#msg-857054 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,857054#msg-857054 jefbed Reprappers Thu, 25 Jul 2019 21:27:12 -0400 https://reprap.org/forum/read.php?4,856448,857035#msg-857035 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,857035#msg-857035 tmccar Reprappers Thu, 25 Jul 2019 07:34:29 -0400 https://reprap.org/forum/read.php?4,856448,856824#msg-856824 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856824#msg-856824 tmccar Reprappers Sat, 20 Jul 2019 05:34:43 -0400 https://reprap.org/forum/read.php?4,856448,856789#msg-856789 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856789#msg-856789 jefbed Reprappers Thu, 18 Jul 2019 20:45:21 -0400 https://reprap.org/forum/read.php?4,856448,856581#msg-856581 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856581#msg-856581 Ohmarinus Reprappers Mon, 15 Jul 2019 07:21:25 -0400 https://reprap.org/forum/read.php?4,856448,856574#msg-856574 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856574#msg-856574
I am finding that this last section of filament expands and gets stuck in the tube. But maybe that's because it's blocked up ahead at the nozzle?
[attachment 112049 20190715_095612.jpg]]]> tmccar Reprappers Mon, 15 Jul 2019 05:09:21 -0400 https://reprap.org/forum/read.php?4,856448,856573#msg-856573 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856573#msg-856573
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tmccar
The hot-end fan was not running.

Please explain "heat break"

A heat break is a material that is placed in between the hotend heater block and the heatsink of the hotend to prevent heat creeping up into the heatsink and the machine parts. The heat break also makes sure that the transition zone for the plastic to melt stays as short as possible.

See it this way: if heat creeps up the hotend, the filament starts to melt outside of the hotend heater block and will cause issues because it usually is only hot enough to make the filament pass the glass-transition temperature. This causes a 'plug' (term), that wedges itself, usually right above or in the heat break zone.

The cooling fan is supposed to cool down the heat sink to circulate the air away by flowing air over the heat sink. Convection.

The heat break is the thin metal tube part on the E3D v6 hotend in between the heater block and the heat sink:
[attachment 112048 cjuNi.png]]]> Ohmarinus Reprappers Mon, 15 Jul 2019 04:44:08 -0400 https://reprap.org/forum/read.php?4,856448,856570#msg-856570 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856570#msg-856570
Please explain "heat break"]]> tmccar Reprappers Mon, 15 Jul 2019 04:07:43 -0400 https://reprap.org/forum/read.php?4,856448,856553#msg-856553 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856553#msg-856553
The reason is you would get a little 'washer' of plastic form between the nozzle and the heat break, or just leaking plastic, either is bad.]]> Pippy Reprappers Sun, 14 Jul 2019 15:34:19 -0400 https://reprap.org/forum/read.php?4,856448,856478#msg-856478 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856478#msg-856478 the_digital_dentist Reprappers Sat, 13 Jul 2019 06:47:23 -0400 https://reprap.org/forum/read.php?4,856448,856475#msg-856475 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856475#msg-856475 tmccar Reprappers Sat, 13 Jul 2019 05:36:21 -0400 https://reprap.org/forum/read.php?4,856448,856468#msg-856468 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856468#msg-856468 Ohmarinus Reprappers Sat, 13 Jul 2019 03:22:19 -0400 https://reprap.org/forum/read.php?4,856448,856466#msg-856466 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856466#msg-856466 tmccar Reprappers Sat, 13 Jul 2019 02:17:43 -0400 https://reprap.org/forum/read.php?4,856448,856449#msg-856449 Re: Blocked nozzle https://reprap.org/forum/read.php?4,856448,856449#msg-856449 Ohmarinus Reprappers Fri, 12 Jul 2019 13:15:34 -0400 https://reprap.org/forum/read.php?4,856448,856448#msg-856448 Blocked nozzle https://reprap.org/forum/read.php?4,856448,856448#msg-856448 I thought it might be a problem with the nozzle, but I fitted a new one and the same thing is happening.
I have set the extruder temp to 240 degrees.]]> tmccar Reprappers Fri, 12 Jul 2019 13:04:17 -0400