I print these on my CEL Robox, lay on their side, using the fat nozzle (0.8mm) at 0.2mm layer height

Because of first layer spread, they need a slight trim using a Stanley knife blade to remove the excess between the two fingers - other than that, they fit nice and tight where the standard flat clips go, but create a right angle between two Twinkly Square panels - I use two per edge, so 24 per 6 panel cube and 48 per 24 panel cube.

I have so far tested these on a 6 and on a 24 panel cube, see photo