Mounting Bracket for Whalen Steel Shelving for OpenGrid plates

Same comment as with the original model:

Fits the Whalen 5-Shelf Heavy Duty Steel Shelving Unit, 48"W x 24"D x 72"H, Black.

Purchased at Costco, item 956873, but also seems to be available on Amazon as well.

Polished the model so that it can be snap into place with tighter clearance.

The low clearance option should fit the longer beams, and the high clearance option should fit the short beams (YMMV).

FreeCAD source file added if further modifications are desired. Clearance and Slot Width parameters can be modified for quick edits.

Print with 6 walls, tested in PETG but other materials should work well.

Re-used the bracket feature so that it can be used as a mounting bracket for Opengrid plates or anything else that can use an M4 screw.