RJ4JP-01-08 15mm bearing Split Carrier

The original by [FerociousDiablo](https://www.thingiverse.com/thing:2402054) was exactly the design I was looking for but just a touch too much play for my bearings so all I have done is reduce the inner diameter to 15.1mm which thanks to my printer tolerances gives me a really nice interference fit for my 14.98 diameter IGUS. The [FerociousDiablo version](https://www.thingiverse.com/thing:2402054) is a remix of [Crashc0de thing](https://www.thingiverse.com/thing:2354665).