Replicator clear side panel fasteners.

thingiverse

Nearly every time I lift up or move my Makerbot Replicators 2 and 2X the little black buttons that hold the clear side panels pop out and hide under a heavy piece of furniture or worse. These replacements are more secure than the originals. This is one of those "things" you can print out of left over filament to use it up in a useful way.