52mm Spindle Mount

I purchased a spindle upgrade kit from Banggood. The kit has a 52mm diameter spindle and will not fit the original mount that the 3018 / 3018 Pro comes with. The bearings and threaded insert from the original mount were extracted and reused for this mount.
I would suggest that at first about 3 layers should be printed and checked for size and print accuracy. As I don't think that all printers print the same. For this reason I have included necessary to make changes if you want to. This was designed in FreeCad Version. 0.18. So both the source and stl files are included.