What is causing this pattern in the first layer?

Flashforge creator pro 2 with PLA, standard quality preset, textured removable magnetic bed on the build plate.

The first lines are straight, but as it makes more parallel lines to build the layer, it starts to develop a scalloped pattern. This creates issues with smoothness when it fills back to join it from the other side later. I’ve leveled the build plate, although I suspect it’s not perfectly flat and maybe slightly higher in the middle. Is this my problem? It appears to have the pattern even away from the middle if that makes sense.

flustered,
flustered avatar

as others have first too close.

I like to use this as great reference.

https://ellis3dp.com/Print-Tuning-Guide/articles/first_layer_squish.html

MrSlicer,

Too tight back it off.

bigredgiraffe,

This is my favorite guide to start with, it’s not necessarily specific to Simplify3d: simplify3d.com/…/print-quality-troubleshooting/

Your picture looks kinda like the over-extrusion picture to me.

I have also found the orca calibration guide helpful even if not using Orca because it has some explanatory photos: github.com/SoftFever/OrcaSlicer/wiki/Calibration

rexxit,

https://lemmy.world/pictrs/image/06ebae16-77b8-435c-9ba7-42334a37ef9f.jpeg

Result of lowering the bed - perfectly deposited at the middle, underextruded at the edges

moth,

Probably too close to the bed. The gap between your nozzle and your printing surface isn’t big enough, so some of the filament isn’t able to escape and builds up in blobs. Check if the patters’s any worse/more noticeable towards the middle.

rexxit, (edited )

In the case that is an uneven bed, where the middle is slightly high/convex, how do people fix that? I’ve calibrated it twice, but I think it’s still too close in the middle while the standard calibration locations (front center, back left, back right) are perfect

nyan,

Glass bed mods (glass is always dead flat) or careful adjustments of screws and tramming of the bed, depending on your printer design. Or find a way to sample more points when leveling the bed to compensate for the unevenness. (I have a Snapmaker 2, which shipped with a firmware bug relating to levelling that wasn’t found for quite a long time. Those were the most common fixes and mitigations.)

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