Customizable roller adapter for Kossel Mini with 2020 extrusion

I noticed one of my carriage wheels is wiggling, so I ordered new rollers and those, of course, happen to be of different size. The designs available are not exactly non-customizable, but reading through `.scad` and figuring out how to adjust all the hardcoded values is not something a developer can tolerate. Especially if one may expect having to do that again in the future. So based on the existing designs I've made one that is customizable based on parameters that are meaningful.

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