i couldnt find my backing plate so i made this one, the tolderance for the 1/4 inch cable is great but i do reccomend a not to hold it in place. 

printed with mk4 prusa
0.8mm nozzle
.30mm detail
10% gyroid infill
Petg
no supports


honestly it doesnt matter use a .4 nozzle and detail if you want totally up to you