#Strange contraction/separation problems

9 messages · Page 1 of 1 (latest)

vocal blade
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I calibrated my printer, everything worked fine, switched to another filament and this happened. Calibration prints worked great (EM cubes) but now I get this here.

First layer looks fine but the material seems to contract really badly on the following layers. It only occurs on radii not on straight parts of the print so it might have to do something with extrusion/movement speed combination.

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rigid cairnBOT
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ivory shale
# vocal blade I calibrated my printer, everything worked fine, switched to another filament an...

When you say you calibrated your printer and those prints worked. Are you talking first layer calibration or something more? The reason I ask is if you have something like a 0.6mm nozzle in the printer and print a first layer 0.2mm print, it can look really good even though the slicer and printer think you have a 0.4mm nozzle in the printer. Then you go and print a multi layer print it goes to hell and that is what it looks like you have. The infill is the give away for me as its just blobby if thats a word and not a sharp line like I would expect. If this is a VC4 build the rapido hotend comes with two nozzles, a 0.4mm standard nozzle and a hardened I think 0.6mm nozzle that is a darker color. Double check what nozzle size you have in the printer.

vocal blade
# ivory shale When you say you calibrated your printer and those prints worked. Are you talki...

I practically only use 0,6 Nozzles. by Calibrating I mean Z-height, extrusion multiplier, pressure advance. Did that first with another filament (extrudr NX2 matte filament) , printed fine. Switched to the white filament (eSun PLA+), printed some calibration cubes for EM since the value I saved in the slicer seemed a bit low with 0.92, those printed fine but as soon as i started a real print, this happened. I also see that the rounded edges contract so much that it rips the print off the plate. Never had this happen before to that degree. dimensional accuracy is on point on the straight parts (designed to 5,4mm and measured 5,35-5,39mm).

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The Filament was also not opened fresh, stored in a cabinet for some weeks, but moderate climate so no crazy humidity. Had it in the filament dryer for 1-2h but no change.

ivory shale
vocal blade
ivory shale
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strange. Not sure. Let me know if you figure it out

vocal blade
# ivory shale strange. Not sure. Let me know if you figure it out

soooo, it seems to be a bit of a "everything bad came together" situation

  • the filament is old(ish) and already has a tendency to warp on corners, I had this problem with eSun PLA+ already but not to that degree
  • I used the structured PEI builtplate which I haven't used for ages (cleaned it beforehand though), which has way worse adhesion than my goto the blackprint (some kind of FR4/G10 material), just switching back to that already improved the outcome to a degree (at least the shrinkage wasn't ripping the print off the plate)
  • but foremost, something is wrong with my prusa slicer and I haven't been able to find out what, switched to orca slicer and it just works without any major problems

The funny thing is, it did not show in any calibration prints since they tend to have sharp corners, the problem only showed up on radii.