What happened here??

Submitted ⁨⁨2⁩ ⁨days⁩ ago⁩ by ⁨amminadabz@sh.itjust.works⁩ to ⁨3dprinting@lemmy.world⁩

https://sh.itjust.works/pictrs/image/963de60e-25ae-48b1-b51d-4b3f3a9fa0fb.jpeg

Started printing this filament shrinkage test and had to leave the house. When I came back, the whole upper half of the part had shifted after the first few layers, and it left two solid blobs attached and one ball of spaghetti. The magnetic bed doesn’t appear to have moved. Part is still solidly adhered to the print bed. How did this happen, and how can I keep it from happening again?

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MonkeMischief@lemmy.today ⁨6⁩ ⁨hours⁩ ago
Weird possibility! I once tried to lubricate my machine and put a drip or two on the threaded Z axis rod. BAD IDEA.

This lead to VERY minor slippage once the gantry hit a certain height, and it would do exactly this. Lots of loud collision, very scary.

…So make sure your Z rod isn’t slipping, or slippery?

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abcdqfr@lemmy.world ⁨2⁩ ⁨days⁩ ago
Test failed successfully. Excess material hit the bed, cooled, head collided on next pass, layer shift. Keep the head clean and fine tune to eliminate over extrusion. If bed is not level and first layer bungled, same story after leveling and cleaning bed

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- amminadabz@sh.itjust.works ⁨2⁩ ⁨days⁩ ago
  This is the first print I’ve done after removing and thoroughly cleaning the nozzle, unclogging the hot end, and adjusting the extruder clamping force. Guess it could be that the bed needs leveling, I haven’t checked it in a while.
  
  Honestly starting to think this blue filament is cursed, something goes wrong every time I use it. (I do dry it thoroughly every time I take it out of storage)
  
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  - natecox@programming.dev ⁨2⁩ ⁨days⁩ ago
    You say you cleaned the nozzle, did you do a cold pull? Sounds like a potential clog.
    
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PointyFluff@lemmy.ml ⁨2⁩ ⁨days⁩ ago
Ender 3, that’s what.

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TrapRag@lemmy.world ⁨2⁩ ⁨days⁩ ago
Looks like theres some other advice I’d try first but have you checked/calibrated the e-steps?

Esteps are easy to check, use a fine scale or calipers and a sharpie to mark the filament 100 & 110mm before it enters the hot end and then jog the extruder 100mm and measure how much it has actually extruded.

Tutorial here that covers pretty much every way to cal the steps but I suggest skipping from the set up down to the calculation and then to the “cowboy method” all3dp.com/…/extruder-calibration-calibrate-e-ste…

If that doesn’t seem to be the culprit you could try keeping an eye on it when you have time to see if material keeps oozing a little when the nozzle reaches the end of a tool path or during a travel. If so you can try tinkering with coasting and retraction settings. If defects seem to occur more during travels there are settings to avoid traveling over printed areas or you can try enabling z-hops.

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- amminadabz@sh.itjust.works ⁨9⁩ ⁨hours⁩ ago
  I think I checked the e-steps when I upgraded the extruder (been I while, I don’t remember) but I can check again
  
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couscous@mamot.fr ⁨2⁩ ⁨days⁩ ago
@amminadabz
I dont know this printer, but this looks like a massive Y axis shift because of a weak Y motor when any problem happens (i used to fix this by tweaking the stepper and get a better couple)
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