This is a laser-cut acrylic box that fastened by plastic push-in rivet.
I tried 3 different kinds of rivets, R2056, R2672 and R3090. This file is prepared for 2.6mm material and 0.35mm laser gap.
All of them work pretty well. So I decide to use R2056 ones to build a box.
When the rivet is inserted, make sure the gap in rivet is perpendicular to acrylic panel.
When you push the rivet in, it should be griped by the slot.
Repeat this step for all rivets.