This is a parametric model designed and built using onshape.

Link to onshape is here and you can create a copy to suite your needs. All important parameters are made into variables and labeled.

The attached STL's are for 180x90x45 mm Inner space. The holes are for 6X3 mm magnets so that the the base can slide and latch in. Magnets are optional as the holder you apply double sided take and stick it under the table.
 

Please watch out for any beams etc under table as that can be an obstruction.

Takes about 24 hrs to print on Ender3 v2 with .4 mm nozzle.