About this 3D model
A variation of Irv's cable holder. I adjusted the table clamping widths. Only 7mm showing on the top and not angling the bottom table clamp, but sloping it for easier printing. I also shortened slots and added a groove to set the connectors in. You can print with supports but I dislike trimming supports. I paused the print at layer 178 (26.7mm) and scotch taped a piece of folded cardboard at the top of the vertical riser that acted like a support and got a decent print. If you adjust the thickness of your clamp for your table that layer number will, of course, differ. BTW Irv's FreeCAD tutorial is excellent but I prefer to switch to the Mesh work bench and manually create the mesh object and not rely on the mesh export defaults in the Parts Desing workbench. Dr. Vax FreeCAD tutorial