If you want to use this mount you have to cut your rail. I reccoment cutting rail to width of the place you want to put it in -7mm. You can put it right to the ceiling when mounting. And don´t forget to put those hangers first :) . I reccomend printing with 0,4mm nozzle and it doesn´t matter what layer height you use. Don´t use any raft or brim.
The author hasn't provided the model origin yet.