I have an ender 3 v2 and i’m using a 0.12 wall height settings and I cannot find out why this is happening. I’m using a 0.4mm nozzle, my retraction is fine, and have leveled the bed already.
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Brim alternative I've been messing around with: make runners.
If your slicer supports it, you can add small connectors to the pieces so they will support each other. A 0.2mm single layer line, 0.8mm wide (or whatever 2x your nozzle diameter is, so it's just two lines), and as long as you need to connect the pieces. When it's done whether it's pla or PETG, it's small and weak enough to be ripped or snapped off the part with a tug, but strong enough to act as a support between parts. A pair of nips like those blue handle ones thrown in with many printers can make a clean edge.
If the parts aren't enough to support each other, you can make an outer frame to connect them to as well. Still toying with settings for these myself, but maybe try tall enough for 5 layers, and wide enough for 4 walls. So, maybe 1mm tall and 1.6mm wide? Connect the smaller runner boxes between the outer frame and the parts themselves.
I tried this on some tiny, TINY parts earlier today (individual fingers for a normal 100% Dummy 14 model). They were definitely too small to come out clean, but they did all stay in place at least. That's a US Dime in the Pic for comparison.
