FreeTantilus Bed Thumb Screws
Thingiverse
8 model
Free
FreePrintrbot Simple Bed Leveling Screws
Thingiverse
FreeGraber I3 Bed Pillow Block to 4 screws
Thingiverse
FreePrusa i3 bed level screws
Thingiverse
FreeAnycubic Kossel Toolholder with Bed Leveling Sensor Store without screws
Thingiverse
FreeWing Nut Grip for M3 screws (e.g. Anet A8 bed level screws)
Thingiverse
FreeAnet E12; Z-axis sync screws and run on one stepper motor and reduce bed leveling.
Thingiverse
FreeHevORT Wobble Rings for 16mm balscrews
Thingiverse