3d Print wall Issue when head approach direction changes

Snapmaker 2.0
1

I have been trying to print a larger model and keep having an issue with a wall defect that appears where the 3d print head approaches the wall from a different direction. Attached is the larger piece I am trying to print. Also attached is a test STL that replicates the issue with less filament and time.

I have calibrated extrusion and retraction repeatedly. At first I thought it might be horizontal hole expansion being negative…but that is set to 0. I am using Cura 5.0.

WallRidge
WallRidge1124×615 95.4 KB

sampleridge
sampleridge982×497 88.1 KB

SmallTest.stl (3.8 KB)
AnotherTest
AnotherTest1083×418 94.2 KB

2

Do you have any play in the bed? It shouldn’t really deflect if you grab the edge and pull up and push down.

There’s also a long thread about a bump in the Y axis that might be relevant.

3

By hand, I cannot detect any play in the bed.

I will read through the Y axis thread and see if that applies. Thank you for the reply.

4

That looks an awful lot like mechanical backlash in the feedscrew. There’s a software compensation for it that’s been discussed on this forum. There’s no hardware solution for it unless you’re a machinist.

5

Unless it’s play in the head/x-rail bracket. Bed was mentioned checking but not head.

-S