The file 'Beepo (with Door Bell Beeper) 3D Printer Model' is (stl) file type, size is 107.8KB.
https://www.thingiverse.com/thing:4441076 presented a thumb screw to replace the wing nut on the front-left corner of the BIBO bed. It is too wide for the other two positions.
I have created a smaller version to fit the right-front corner and the back-center.
A M3-.50 nut is required.
beep_beep_beepo.stl | 263.9KB |