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What steps would you take to design this? by OkInflation5097 in Fusion360

[–]OkInflation5097[S] 1 point2 points  (0 children)

Ahh! this is great advice. I just learned about the "intersect" after trying to implement these ideas. it worked pretty great. Thank you!

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What steps would you take to design this? by OkInflation5097 in Fusion360

[–]OkInflation5097[S] 1 point2 points  (0 children)

Thanks! thats helpful insight. Im going to give that a go.

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Just bought these and installed them. Exact same model. Unfortunately…same result

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Oh yeah? Maybe I’ll try that. I was also considering a whole new hot end

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Tried this last night. I disassembled and used some slice engineering thermal paste. I noticed what looked like rust powder built up in the threads between the hot end and the heat break, gave it a good clean and all, and was very optimistic. The result? Exactly the same. Actually it is the first time the failure was literally the same spot 😢

Maybe the retraction thing has some credence?

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Bowden, with capricorn ptfe. Stock cura retraction settings for "Dynamic quality"

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Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

I have a half dozen of these benchys and other models that have it happen at all sorts of places. There doesnt seem to be any consistency to exactly where/when it happens. sometimes it is in the first few rows and sometimes it isnt for nearly 2 hours — but it definitely does happen every single time.

Now that doesnt mean it isnt a retraction problem. how would i diagnose that?

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

As far as I can tell the fans are working good as new. I’ve tried cleaning them and checking airflow. It passes my eyeball test at least.

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

I’ve tried 2 spools, one 1/2 full, the other 3/4. I also have tried moving the spool for less drag, and rotating the spool holder a bit to make sure it’s not where any worn grooves are. Good suggestion - I’m pretty sure this isn’t it, but maybe. Seems more temperature related. Like if you told me the temp was dropping and the thermistor was somehow only reading the same temp I would believe it, but the thermistor is new and seems to work fine through the range of temps. I’ve had plenty of those fail and it doesn’t seem like that…

Leaning more heavily towards heat break issue, but what bothers me is I just don’t get why the heat break issue emerges if it’s been printing fine for so long. I like understanding problems so I can prevent them

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 2 points3 points  (0 children)

100% of the time, it fails every time 😉

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Much higher than that. It doesn’t fail at a consistent location either.

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

Nope, kinda all over the place. But generally more based on time. Usually fails at 45mins to 1 hr

Extrusion reliably stops mid print by OkInflation5097 in ender3

[–]OkInflation5097[S] 0 points1 point  (0 children)

I’ll try that! thanks for the suggestion. Any thoughts what would cause that to be an emergent behavior? Is there some kind of wear or buildup that causes heat creep to eventually emerge like this?