[Nearly] Screwless E3Dv5/Bowden mount for QU-BD's One Up/Two Up

This is a quick and dirty CAD fuse of two great things - MacAttak's brilliant E3D mount and Lonuf's excellent bearing holder. The mount snaps right on the bearings and the E3D slides right in. Things are light enough that no additional fasteners are needed, but zip-ties are recommended around the bearings (Lonuf's holder has holes for them).

The mount works perfectly for me and gave me 5 cm more build height compared to what I had before (for a total of 15 cm in theory). In addition, it all