This is a bracket for the DewBuster heater which keeps dew from collecting on telescopes and other astronomy equipment. It has an 8mm hole for hanging it which should prevent the need to tape/Velcro it somewhere or hang it from the cables.

It fits the standard DewBuster (https://www.dewbuster.com) which is approx. 4.4" x 2.4" x 1.2". Mine is slightly larger than that so there's tolerance in the bracket to fit around it. It probably fits the Newtonian DewBuster too.

The model is somewhat parametric so if you need to change the overall thickness for a strong or weaker material or adapt it to something of a similar shape/size that should be easy in FreeCAD.