Remix of 22alex3's original from Thingiverse: I rebuilt the model in SOLIDWORKS and added some fillets to most of the edges to reduce the chance of chips and of damage to the cable's insulation. I chose a length of 15 cm because it gives some margin for error in placement and allows the cable to angle under the door if needed. I printed this with PETG, and it turned out quite well.
The author hasn't provided the model origin yet.