Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4798100.

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.