Ultimaker Tool Holder

This is a newly (from ground) designed tool holder. But inspired by "Werkzeughalter". Like the original it is designed to fit on the top side of your Ultimaker printer. Unscrew two screws from the top side, and refit them while mounting the tool holder. The design perfectly fits the design of the Ultimaker printer.

The redesign is based on experience while using this tool holder. It holds (from top left, to bottom right):
- Card (credit card size) for bed calibration purposes
- Hex keys hol