RRC[

Rat Rig Community [Unofficial]•17mo ago

Decker

Consistent Jams With Chube

I have been getting jams in the heatbreak of my conduction chube for a while. They can currently be reproduced consistently under the following circumstances:

• An entire print completes with PETG. The next time filament is extruded, it will be jammed.
• PETG is unloaded. If I load PETG, take it to temperature, (optionally) extrude some, and let it cool down, it will not jam.
• PLA is brought to 150 C. This is the least tested option, but it does mean that PLA cannot begin a successful print as it will jam before the prime blob even begins. PLA also seems to jam by the time of unloading. Unsure if this is the act of unloading or something prior.
• I have not tested ABS / ASA with this hot end.

This is a conduction chube with an LGX Pro and the LGX CHAMP adaptor.

Possible issues:

• Wrong PTFE tubing? The jam on unload was noticed before swapping to a PTFE tube with a larger ID. There were a few instances where the tube was not set properly, but that was not always the case. I do not believe this to be the issue. This refers to the PTFE tubing between the extruder and the hotend.
• Not enough cooling? Most of these were using the passive cooling of the CHAMP adapter. Some were tested with a 40mm fan mounted. No change was noticed.
• Wrong Temperatures? The PETG was printed at 230. The PLA was supposed to be printed at 220, but jams can be found at 200 and possibly 150. I am going to double test that jams happen at 150 after sending this post (because I need to take off the nozzle and unjam it to test.)
• Insufficient thermal paste? Untested. It is possible that needing to remove and replace the chube from the mount so often has removed too much thermal paste from where the heatbreak meets the heatsink. I have little thermal paste on hand, so I would rather eliminate other options before testing this one more.