What's causing this pattern on my first layer?
What's causing this pattern on my first layer?
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
That is a high quality slice of tuna.
41Thanks, now I'm hungry
10
Possibly a little too close to the bed. Causing filament to push out and overlap beyond where it should.
12I tried adjusting the z offset to raise the nozzle, but it didn't help.
3Maybe you didn’t raise it enough? It is definitely the sign of being too close to the bed.
10
you're layer adhesion is fine?
Do you see the pattern in the textured bed? what happens if you get some modeling clay or playdough or a kneading eraser, or anything like it and press it to the plate?
If it's not just a texture coming off the build plate (guessing not on your comments?) and it's not from your z offset/first layer height, then I would look at your temperature settings (might be too hot?) and check that your expected extrusion widths are matching what you are in fact getting.
9Layer 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.
6
I call this one: out of sight, out of mind
7It was out of mind until I got this new build plate with a fancy texture that I want to imprint on my prints.
3Not 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.
2
This is either A: Simply too close to the bed, or B: Your nozzle is wallowed out due to printing glow in the dark filament or carbon fiber, so you're printing a fatter bead of plastic than your slicer thinks you are.
This is the result of your nozzle tearing up the previously laid down plastic and folding it over as it follows the path.
5I 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?
3This looks kinda like ABL compensation I usually run bed visualizer when I see patterns like this
2My 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
5
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.
0Sorry but this is not even close.
-1