MakerGear M2 Tool Holder for modified spool holder

This is another version of a tool holder that piggybacks onto this modified spool holder by slipshine: http://www.thingiverse.com/thing:37210

I liked the idea of being able to store my commonly used tools in a handy rack on the M2, but I also liked slipshine's spool holder for some specialty filaments I've been using. Since his spool holder uses the frame mounting hole that most other M2 tool holders exploit, I decided to exploit the new rack - this mounts on the front upright tube.

My design incorporates a rectangular block on the left that is sized to act as a snug seat for this Z-knob stay: http://www.thingiverse.com/thing:267185

The picture with the tools shows all the items that the holder holds.