Extra modules for Ultimate Modular Tool Holder Rack

These are a couple of extra modules I designed to work the [Ultimate Modular Tool Holder Rack](https://www.thingiverse.com/thing:1335846) by [Lay3rWorks](https://www.thingiverse.com/Lay3rWorks/about). The added modules are for holding:
* a caliper
* a roll of tape
* pliers
* a USB drive and three SD cards

There are many tool racks available on Thingiverse but I like the modular setup because it allows me to customize the rack to my needs. Other racks are excellent, but often designed arou