Knife Sharpening Tool V3

I really liked CNCKitchen's design, but I wanted some extra refinements, making the construction a bit simpler, using not so many different types of screws.

## Changes from V2.1:

- redesigned handle for quick switching of stones.
- moved legs forward 2 cm for extra stability
- added hole on bottom for adding a 40mm [suction cup](https://www.aliexpress.com/item/4000434397217.html)
- tighter tolerances for 10mm tube holes.
- tighter tolerance for guide-slot.
- changed screw-mount for vertical tube to press-fit.
- added a cap for vertical tube.
- capped holes on feet.
- added user Badpassword's guide (great print-in-place design)
- optional 10mm handle & guide so you only need 1 size tube.
- Created smaller angle guides, you need these to be able to set the angle on the knife itself, to compensate for knife angle.

## Hardware needed:

- 2x 10mm diameter x 180mm aluminum rod/tube for the body
- 6mm (or 10mm) diameter x 280mm aluminum rod/tube for the handle
- 1x M5x2