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What's causing this pattern on my first layer? (sh.itjust.works)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

18 comments fedilink hide all child comments

I'm printing with PLA on a "PEO" print bed (really a textured PEI), on my heavily modified ender 3, and there's a pattern on the bottom of my first layer that I'm trying to get rid of. The top of the first layer looks fine, and changing the z offset in either direction doesn't help. I've also tried slowing down the print speed because I thought the extruder might be skipping, but I'm still seeing it at 10mm/s. Any idea what could be causing it, and how to get rid of it?

Pic: https://sh.itjust.works/pictrs/image/31cd6cef-16de-47b3-995f-197f7d0b432d.jpeg

Edit: the first layer went down from the bottom left to the top right, but the pattern I'm seeing is perpendicular to the extruder path

all 25 comments

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[–] [email protected] 12 points 7 months ago (1 children)

Possibly a little too close to the bed. Causing filament to push out and overlap beyond where it should.

[–] [email protected] 3 points 7 months ago (1 children)

I tried adjusting the z offset to raise the nozzle, but it didn't help.

[–] [email protected] 11 points 7 months ago

Maybe you didn’t raise it enough? It is definitely the sign of being too close to the bed.

[+] [email protected] 8 points 7 months ago (1 children)

[removed by mod]

[–] [email protected] 6 points 7 months ago* (last edited 7 months ago) (1 children)

Layer adhesion is great.

No, this pattern isn't coming from the bed. The bed actually has a polygon pattern that I'm trying to get the plastic to pick up. Sellers on Amazon/ebay/Ali are calling it PEO, but it's really just PEI with a fine texture that diffracts light. The pattern from the bed comes through really well on the perimeter of anything I print, but not the center.

I forgot to mention, but I also played with the extrusion multiplier (both directions) and it didn't make a difference. I've also gone through the klipper docs and TeachingTech's calibration guide, the printer is fairly well calibrated at this point.

[–] [email protected] 7 points 7 months ago (1 children)

I call this one: out of sight, out of mind

[–] [email protected] 3 points 7 months ago (1 children)

It was out of mind until I got this new build plate with a fancy texture that I want to imprint on my prints.

[–] [email protected] 2 points 7 months ago

Not sure how much this is worth, but it seems to me what happens is that a flap squeezes out forward when you're a little too close, or when the bed isnt adhering well to the material, which can be sometimes improved with some more heat. By habit I always clean with Isopropyl and I notice it less on my textured Prusa bed.

[–] [email protected] 3 points 7 months ago (1 children)

This looks kinda like ABL compensation I usually run bed visualizer when I see patterns like this

[–] [email protected] 5 points 7 months ago* (last edited 7 months ago)

My bl-touch mount broke so I've been doing manual bed leveling for a while. I just finished printing a 185x185mm part (half of a dactyl keyboard) and the first layer looked great from the top.

Edit: I also deleted the old bed mesh from my klipper config when the bl-touch broke

[–] [email protected] 3 points 7 months ago

I would have guessed the same as others that it was interactions between the nozzle and the bed or some texture on the bed. Especially since we don't see any normal extrusion lines which are normal on the first layer.

Since you're confident it's not, are there artifacts elsewhere on your prints that might be a clue? Is there anything going on with your nozzle? Maybe some wear, chips,or inconsistent flow? If you print just the first layer what does it look like from the top? Does it help describe what we're seeing?

[–] [email protected] 1 points 7 months ago (1 children)

Bad bearing on a moving part. Or a bur along a rail, It catches just enough to cause the smooth motion to jitter a bit as the head moves along. Blobbing the material down instead of spreading it nice and even.