Very simple and small cable holder with magnet inserts. Hole for cable is 3x6mm, magnet inserts ar d=4mm, high 3mm. Weight 0.55g (PLA and 0.20mm ).
No supports, no brim. Nothing special. Quick print.
onshape model https://cad.onshape.com/documents/148d804d99080a994c88cec0/w/c1136a807bdd58a796573fa9/e/9e7a5287e881afb6a7b4e493
The author marked this model as their own original creation.