Easily be able to make a test fit of the holder prior to printing a full model.

Scale as needed based on the dimensions.

The original model at 100% has an interior measurement of 165mm.

You can figure out the scale % based on the interior distance of the legs.

The tool is easier to use than using 2 T-Squares.

Print 3 of these and join them together with (2) 3-inch long ¼ inch thick bolts and wing nuts.  See the Image as a reference.