These magnetic feet allow your rotary to sit flush on your laserbed while staying in the same position. No pins or doodads necessary. Ultra strong magnets hold your extrusion in position.
 
Attaches via  20x40 V slot aluminum extrusion found on most commonly used rotaries.
 
3D printed
 
Comes with T nuts and all necessary hardware to install minus the end screws for your extrusion endplate.