this post was submitted on 29 Jun 2023
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Ender 3 Pro adhesion problem and magnetic bed advice (lensdump.com)
submitted 2 years ago* (last edited 2 years ago) by feecoomeeq to c/3dprinting
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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 1 points 2 years ago (1 children)

! this reply is for 30.06.2023 morning state. I'll post a today's update around an hour !

THANK YOU for replying. I'm pretty desperate since the r/Ender3 is private and have spent yesterday ~5h trying different settings.

Actually I think I'm leveling to close to the bed. As I described, I slide the paper under the nozzle and tighten the gap to fell much friction. Yesterday with some trial and error, I set the Z-offset to zero and the nozzle was so close that no filament was extruded. I started to make a slight gap as the paper barely drags between the gap and its better this way.

  1. As above, increasing the distance was a good idea, the temp. also went up 215/60 first layer and 210/60 rest.
  2. I tried placing the magnetic sheet on the glass bed, adjusted the Z limit, but the adhesion was poor. I'll try it another time, when I'll make the printer work properly.
  3. Print temp increased, first layer 10mm/s rest 40-50mm/s. I'll try to record how the extruder works.
  4. I just found this vid and seems like loading filament to the extruder is a bit of a pain https://www.youtube.com/watch?v=8i4FBZ1jZk4
  5. I washed the magnetic sheet with dish soap, but can't say it helped. BUT cleaning the glass bed with isopropyl alkohol for like 10 minutes to get all the glue stick and gair spray off worked reeeeeeealy good. The adhesion of first layer was right back.
  6. I think I unclogged it, but today I'll try an extrusion test to see if the filament bends or runs straight.

Still ToDo: • Run calibrations for e-steps (printer hardware) and flow rate (the filament you’re using). • Calibrate retraction length using a test print. What’s your current retraction length and speed btw? • should verify that it has thermal runaway protection enabled in firmware.

"I made some printer vibrations dampener" They actually made a noticeable difference in loudness and didn't cause problems with first 5-8 prints with them: https://www.thingiverse.com/thing:3649851

PHOTOS UPDATE: https://lensdump.com/a/9iY7Q/?sort=title_asc&page=1 or https://i3.lensdump.com/i/CxzqHz.jpeg https://i.lensdump.com/i/CxzVGC.jpeg https://i1.lensdump.com/i/CxzkDo.jpeg

Pic.1: First layer adhesion is back but after the extruder goes to second layer it colides with the first layer, messes the extruded filament and moves the print around. Pic.2: Failed prints and the final and best since now being print which can be seen on pic3 Pic.3: Enabled there 0.3mm Z-hop at layer change and the layers were 0.16mm. Was looking promising at first comparing to the previous prints that had drags etc. from the beginning. After some height it went crap again.

[–] fhein 2 points 2 years ago

I hope it feels like there's some progress being made at least :)

I obviously want the 3d printing community on Lemmy to grow, but if you need more urgent support I recommend the 3D Printing discord. It can be much easier if you have someone to live chat with, and not have to wait hours for a response to your post.