Cable organiser

Just made the chamfers parallel is all

**Update, klipperised my Prusa Mini, and had horrible walls, needed to reduce retraction speeds due to the bondtech extruder (which is weird because it was fine before at higher speeds) and play around with temperature with a plated nozzzle, and was using the clip as a test run to change a setting and print rather than an unusable object.  Anyway, I wanted to get the print using the least amount of unnecessary movement, so I revisited the file in cad and trimmed some more off.  It is surprising how much time is saved by such small changes.