These are mounting plates for the linear, rotary and angle stages uploaded as separate models.

Linear Stage

https://www.printables.com/model/453719-linear-stage

Rotary Stage

https://www.printables.com/model/457219-rotary-stage

Angle Stage

https://www.printables.com/model/464120-angle-stage-10-degrees

Top Mounting Plates

The TOP mounting plates (Universal and Camera) have four holes (3.4mm) in the corners that line up with the stages and allow an M3 socket head cap screw to pass through the mounting plate to secure it to the stage below.

The Top Mounting Camera plate has a centered 6.756mm hole that will allow a 0.25in screw (¼-20) to pass thru as is standard for mounting a camera, laser level, etc.,.  There is a support piece shaped like a cross located in the counterbore area for the 0.25in screw.  The support cross is separated from the mounting plate by 0.2mm on the top and 0.4mm on the sides. The counterbore itself is 4.826mm deep and 15.875mm in diameter.

The Top Mounting Universal plate has 2.5mm holes that can be tapped with an M3 tap.  There is one hole in the center with three rows of holes from the center in each direction.  The center-to-center spacing of the holes is 12.5mm.  The third, or outside row, is spaced 10mm from the second row.

Bottom Mounting Plates

The BOTTOM mounting plates have 2.5mm holes in the corners that need to be tapped with an M3 tap to use.  The corner holes line up with the stages and allow the stage above to secure to the bottom mounting plate with M3 socket head cap screws.

The Bottom Mounting Camera plate has a ¼-20 threaded hole in the middle that a tripod screw can screw into.  

The Bottom Mounting Tab plate has pass thru holes (6.6mm) for an M6 socket head cap screw that are spaced for mounting to 4040mm or 4080mm extruded aluminum t-slots.