I got an antique piece of furniture with a very wide but shallow drawer, which necessitated some dividers.  We couldn't decide how many or how often they should be so while I was cutting up the 3/16" plywood for the dividers I ran off these small brackets to create right angles.  They were sturdy enough that I didn't have to actually glue anything into place after we made our decision and I ran a few more off just in case we divide things even more.

This file makes six of them on a Prusa Mini+, the walls are thin enough there isn't going to be any fill and any Z layer height will work, I did 0.2 with PETG with great success.