How can I fix this ?
I just assembled my MK3 kit and printed a few stuff with the prusa PLA. They came out fine. I had also bought a ColorFabb PLA/PHA.
The problem is that, I just cant get proper first layer adhesion. Tried playing around with the nozzle/bed temperatures. Even the lines printed during first layer calibration (with an active Z config that works for Prusa PLA) does not stick. Finally I settled at the following temperatures : 215/70 for first layer and 210/60 from then on. But I also used the glue stick. And I got decent adhesion. Even then it was not perfect. As in, one of the corners was kinda standing up and then luckily the second layer printed on top of it and it kinda got fixed.
The second problem can be seen in the picture. What can I do to fix that ? Is it because of the angle ? I should have used supports ? It was kinda curve which is why I assumed that supports might not be needed. And even if I added supports it would have landed on the part itself.
Re: How can I fix this ?
Adhesion usually comes down to proper bed prep and Z-height. Make sure the bed is truly clean, and give it a wipe with 91%+ IPA. You could try the 1st layer calibration using the "life adjust" method. If set right, you won't be able to knock the lines off by dragging lightly across them.
For difficult parts with uneven or limited bed contact, there's no shame in using a brim to get it to stick down securely.
Those pics are showing what looks like a curved surface on the underside as it prints. Those are tough angles, but you could try increasing cooling and decreasing temps. Is that the butterfly ear bud holder?
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Re: How can I fix this ?
The prusa PLA seems to work fine. Anyhow, could try using a brim next time. And yes, the plate was cleaned using IPA.
Yeah, it is the earbud holder. 🙂 The design has that part actually 180 degree inverted. But I was just not able to get adhesion and so I rotated it as there would be more surface in contact with the bed.
Those pics are showing what looks like a curved surface on the underside as it prints. --> Correct.
Increasing cooling --> add an external fan ? 😀
Lower temperatures --> Do I just reduce the overall extruder temperature ? Or is it possible to fine tune/adjust the temperature for those specific sections (maybe based on height ?) Or.... I achieve the second said option by manually editing the gcode ? 😀
Re: How can I fix this ?
hi,
what layer height setting was use for this print?
Re: How can I fix this ?
Make sure that you are printing the outer perimeter last
Try variable layer height with thinner layers at the area of the overhang
Slower printing with fan cooling will also help
Regards Joan
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