this post was submitted on 29 Jun 2023
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Ender 3 Pro adhesion problem and magnetic bed advice (lensdump.com)
submitted 1 year ago* (last edited 1 year ago) by feecoomeeq@lemmy.world to c/3dprinting@lemmy.world
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Hello Lemmies.

album with photos in order 1-7: https://lensdump.com/a/9Atmx/?sort=title_asc&page=1

EDIT: Direct links may be more convinient pic 1-7

https://i.lensdump.com/i/CbGQ5c.jpeg

https://i1.lensdump.com/i/CbGJv1.jpeg

https://i.lensdump.com/i/CbGtcQ.jpeg

https://i1.lensdump.com/i/CbGrOM.jpeg

https://i1.lensdump.com/i/CbGEDk.jpeg

https://i3.lensdump.com/i/CbGTse.jpeg

https://i2.lensdump.com/i/Cw2uL9.jpeg

I am new to 3d printing as I bought a used Ender3PRO. After initial problems with no adhesion I leveled the bed a couple of tiems. My method is to pinch the paper between the bed and the nozzle to grab and feel a strong friction taking out the paper-sheet. Then in PrusaSlicer I set the Z-offset to 0.2mm and it started printing fine-ish (pic.1, 2, 3 and 4). I made some printer vibrations dampener and figures (around 14 prints ~1,5h each). Next I printed a PS4 Slim Stand (pic.5) and separations between layers appeared.

I increased a bit the temp and run a second piece of the PS4 stand and a dissaster appeared (pic.6) and since then the adhesion to the bed is gone. One in 5 attempts with some glue the filament sticked to the bed, but the next layers have a lot of missplacements and eventually filament sticked arround the nozzle and a destroyed print.

The problems I noticed since the beginning:

  1. adhesion is not great. The nozzle clean line is 80% of attempts dragged with the nozzle to the center of the bed when the brim starts printing. And gets curved just outside the hotend.
  2. a 1-2mm of filament is always outside the nozzle (overextrusion?). I usually clean it with my fingers - wrong?
  3. the printer has a glass bed but I would like to try using the magnetic Ender sheet. The glass is glued to the printer (pic.7)? Can I place the magnetic sheet on the glass? Should I then set Z-offset on the printer settings to avoid nozzle coliding with the bed?
  4. On retraction, the extruder makes a loud click and sometimes a squeak. Is it normal?
  5. I had a hard time to put the filament in the tube of the extruder. Like it was missplaced and had to bend the tip of the filament.
  6. I washed the magnetic sheet with dish-soap and I'll try my chances today.
  7. The PLA is black, stock Ender3 filament which I suppose is not best quality, but should be sufficient for start... Im also considering moisture in filament as I don't have a sperate room for my printer. Pic.6 - can it be caused by moisture?
  8. After what happender on Pic.6 the extrusion was really poor which I think was due to clogged nozzle. After heating to 240*C, pulling out the filament, needle-cleaning the nozzle the amount of filament extruded returned to what it was at start.

Some settings:

  • 205C and 60C for first layer
  • 200C and 55C for the rest
  • retraction ON
  • no Z-hop (I'll try to avoid it for now, since it didn't help)
  • brim on
  • 0,2 layer height
  • first layer speed 20mm/s, rest ~40mm/s

Any advice welcome and I'll provide more info if You have any questions.

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[–] feecoomeeq@lemmy.world 1 points 1 year ago* (last edited 1 year ago)

Yesterday after another hour or so I think the printer is back on rails.

  • previously my retraction was something from PrusaSlicer defaults so like 5-6mm, now 3,5mm
  • I changed the nozzle to a new 0,4mm which gave good results right away (cleaner first layer and no colision by the nozzle with the lower layer)
  • an IPA clean mentioned in previous comment worked great. Still one layer of paper-glue stick is used and is helpful
  • I leveled the bed with some margin. I always leveled it to fill good friction with the piece of paper, but now, right when the friction starts i loosen the know/spring half of a degree just that the friction is gone.

Gave Cura an another try with this one: https://lensdump.com/a/9ZGlC first successful print from the start of this post

  • flow 0,9 and initial layer flow 1,01. In PrusaSlicer it was 0,95 I think
  • layer height 0,2
  • initial layer height 0,2
  • Z-hop 0,3 (sadly had to use it to avoid hitting the previous layer
  • top/bottom layer pattern = concentric
  • infill 20%
  • printing and initial nozzle temp = 210*C
  • printing bed temp 60C, and initial 65C
  • print speed 40mm/s, and top/bottom print speed 10mm/s
  • retraction enabled with 3,5mm distance
  • brim on
  • Travel Tab: ENABLED: retraction, retract at layer change, z-hop when retracted, z-hop only on printed parts. Yet to try combing mode
  • infill pattern = cubic

second successful print (Cura too): https://lensdump.com/a/9ZaX5 :

  • only changed initial layer height = 0,15mm
  • the print-initial nozzle clean at the bed edge still sometimes gets dragged to the center but it happens partially or doesn't mess the print and I can pick it up after brim is printed

third successful print (PrusaSlicer gave me warnings about supports needed, but Cira didn't):

BTW. Its printing this https://www.thingiverse.com/thing:5193117

Tips/ovservarions welcome and thanks everyone for the comments which I've read and gave me ideas what to check/google <3