These models are for a Multi-Cable Snap-Lock Clamp designed specifically for flat type Romex wire 10-3, 10-2, 12-3, 12-2, 14-3 and 14-2.  It can also be used for many other types of cables such as Cat-5, coax or telephone.  I've included 2 models. The first one uses a nail for the main support hardware.  The second uses a screw.  Both provide an optional second mounting screw hole for a dry-wall screw if additional support is needed. These are intended to be mounted directly to studs in attic space or crawl ways between up stairs and downstairs or below bottom-floor crawl spaces. The built-in Snap Lock gate quickly and easily secures all cables. These are similar to the Gender Bender cable clamps available at your local hardware store. 

I do not recommend printing in PLA as PLA isn't durable enough and will break down in time. PETG, ASA or ABS would be good choices.  The model prints well without supports. I recommend 4 or more wall loops and a high infill percentage (33% or more) for strength.