Seems the left frame plug on my 2007 Suzuki DR 650 SE kept coming off..... after replacing it a few times, I just left it open. Until I got my 3D printer.
I went through a couple designs which either were too tight and cracked, or were too loose and fell out during a ride.
This one seems to be holding well with just friction alone.
I printed the one pictured in ABS.
dr650_frame_plug_revision_1_rounded_edges.stl | 1.1MB |