I'm working on some small car interior trim clips that have to rely on layer to layer bonding strength. Filament is Inland PETG, printer is stock Ender 3 with Capricorn tubing.

When I run just one test print it functions well, but with the same settings when I run 21 they all break along the layers at about the same high stress point. If I set up Cura to run then in "One at A Time" mode I can only fit 4 on the bed at a time, and I'd like to print much larger groups.

I'm printing at 0.2mm, 17.5 mm/s, 255F / 70F, and pretty much all of the part is made of walls as it's pretty small (about 0.750" x 0.750").

What else can I do to optimize the layer to layer bond of the PETG? Thanks!

Armrest retainer r2b.jpg