Xacto holder for desk use

This is a remix of "Wall mounted xacto holder" by jeremygold, http://www.thingiverse.com/thing:684621

Instead of as wall mount, I modified it so I can use it while crafting to safely store the knife. I mount the holder onto the side of my tool box a clip. The knife entry has been cone-shaped for easy access.

Modifications in the OpenSCAD file attached have been clearly marked.