FRC 2023 jig

As part of the 2023 FRC competition, one of the game pieces is an inflatable cube. FIRST designed a jig that is used to calibrate the correct inflation level. The jig has precise internal measurements and weight.

To use the jig, see https://youtu.be/55_o88WUCS8

The jig has to be exactly 20 ounces in weight, which is very heavy for 3-D printing materials, and hard to calibrate. To add weight and allow for calibrartion, my design includes four holders sized to hold US one cent pieces ("pennies").

I printed in PETG with 15% infill, and I found I needed a ballast of 136 pennies (34 per holder).

You will need to print:
* 1 x handle
* 1 x left leg
* 1 x right leg
* 2 x front coin rack
* 2 x back coin rack
* 4 x lid

You will also need 6 M3*12 countersunk bolts with hex nuts. Could probably use glue instead.

The legs attach to the handle with dovetails, secured with nut and bolt. You'll see which side has the hex and which the countersink. The coin racks slot i