"Fungi" and "Blobs" on otherwise perfect surface prints
Greetings!
I've recently started experimenting with CF-Nylon and, after some initial Bed Adhesion issues on the PEI ( Sticky Glue FTW ) and consistent dimensional inaccuracy ( Extrusion Multiplier changed from 1.04 to 0.7 ) one of the last challenges I've come across would be those "fungi" and "zits" appearing around the surface regardless of seam positioning.
Photos:
Video:
Slicer Extruder Settings:
Simple shapes like a Calibration Cube sure are printing flawless but anything requiring the toolhead to cross a gap has these issues... Is this perhaps a Retraction related issue or simply the nature of the material with the ~20% CF content smearing along as the nozzle crosses borders? 🤔
RE: Filament
Did you dry your filament? Nylon soaks up water.
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Chuck H
3D Printer Review Blog
I'd say I did
Sure did, the spool has been permanently residing in an eSUN eBox Filament Drying Box set to max Temp ( 50°C ) incl. a Dessicant Pouch before and during the prints 🤔
Extrusion
Try lowering the Extrusion multiplier one more to 0.6 and see what happens.
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Chuck H
3D Printer Review Blog
eSUN eBox Filament Drying Box set to max Temp ( 50°C )
This is not adequate, you need 70C active drying, meaning 350watts minimum with a strong active fan circulating. run it the entire time your printing the nylon.
Good Luck
Swiss_Cheese
The Filament Whisperer
RE: Drying
I just read this again from work. I agree with Swiss Cheese.
The bottom line, is you need more time and at least 70C if not 80C.
Sure did, the spool has been permanently residing in an eSUN eBox Filament Drying Box set to max Temp ( 50°C ) incl. a Dessicant Pouch before and during the prints 🤔
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Chuck H
3D Printer Review Blog
Yeaa...
There's not much I can do about raising the temps in that enclosure.
I mean the manual states that the built in heater plate raises the temps to 80°C with expected actual temperatures getting circulated by the also built in (and super noisy fan ) in the 50°C but yea... Can't raise it higher than that 🤔 The Spool also arrived inflated ( or at least without a vacuum ) indicating the presence of untreated air inside but a lengthy treatment inside the dryer probably dealt with most moisture that managed to get inside.
I did though in the meantime play around with retraction settings ( like increasing them to 5mm, enabling wipe, etc... ) and reducing the temperatures back to 260°C from the previous 270° due to the higher speeds at which I'm printing while also increasing the cooling fan % and it looks like those changes were helping a fair bit with solving the problem. 🙂