Leave on tool holder attachment for 2x v4

V4 increased the width of the arms to prevent cracking when inserting the gauge. Also uploaded Inventor Part file for community modifications. Added an STL with multiple mounting points.

Improved the design to maximize stability and provide a better platform for the dial gauge. Added connections on the side for attaching tools giving maximum flexibility.

The one piece clips onto the heat sinks of the 2x and provides a platform for other tools to be attached to. It's designed specificall