Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5169872.

This cable tie base is 19mm (3/4") square and just 5mm high, and has been designed to print easily and quickly at 0.2mm layer height and without supports. You just need to add some double sided tape (the thicker "foam" tape works best).

The openings have an arched design to reduce the bridging length, and it features internal slopes to make it easy to route the cable ties through the base.

The entire lower surface is solid to ensure good contact with the full width of the double-sided tape.