Improved goBILDA/Matrix/Modern Robotics "Brick" Battery Holder for FTC

These battery holders are designed so that they can be used with locknuts in the inset holes or they can be used with the screws going through the battery mount with the heads being in the insets.  In either case, the mounting hardware will not press into the battery and cause damage.  Holes have a standard 16mm spacing that is compatible with the goBILDA hole pattern.

***v8 UPDATE: Printed and tested to work.  It's slightly loose, but it works and allows for more variation in battery packs.  Our team name (16626 Radical Raiders) is now embossed on the bottom just as a nod to the creators.

A new variant has been added with the mounting holes offset to one side.  A slot for the battery wires was added to the other end as well so that you can choose which way the battery is held in the mount.  Since the batteries are wider than the channel, having a centered mount prevents mounting items next to the battery.  The offset holder allows you to mount things along one side of the channel and next to the battery.

I also included a step file version for easier remixes.

This was created from scratch, but is an improved version of the original.  This version adds several features:

• Rounded edges to prevent damage to the battery
• Slots for a Velcro retaining strap
• Mounting holes have hex insets to hold M4 lock nuts