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What is causing this pattern in the first layer? (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by rexxit to c/3dprinting

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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.

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[–] rexxit 1 points 1 year ago

I have both problems in different locations in the same test print first layer (see the second photo I posted).

What I'm concluding is that when the calibration locations (front center, left/right rear) are level at the ideal height, the center of the build plate is too high. This is either due to convexity of the build plate OR droop of the extruder due to very slight bending of the beam it travels on. I don't know how to fix either of these problems.