Thin walls for Squashball's profile holder

This is a remix (same license as the original ). Thin walls are added to the holder's base triangle so that it does not fall off when printing in PETG. The profile needs to be filed for assembly anyway, this consumes less plastic than a brim (which I tried) or a bridge. Print this piece like the original ( 0.2mm quality profile with 3 Perimeters, 5 top/bottom Layers and vertical shell thickness set to off ), but add “ detect thin walls ". Cut the walls before assembly and file the edges to make it easier to insert.