Chisel Sharpening Jig (608 bearing)

Did some customizations on the excellent model from ucancallmebob89, mostly because I only had the bigger 608 bearing available.

Changes from original model:
* Total remake of the roller.
* Customized main body to fit larger roller.
* Added printable knobs (credit funbart https://www.thingiverse.com/thing:641854).
* Replaced roller axle with printable pegs.

Parts needed:
2x - Hex Head M4 x 30mm bolts
2x - M4 nuts
2x - 608 bearings