This design is for Baltimore's awesome Vex Robotics teams. The one-way plate holder fits a single plate, and the two-way holder fits two plates. There are enough holes to offer some different mounting options.
We've gone through enough iterations to make sure the fit is perfect. The plate stays tightly in the holder, even during rough matches, even upside down, but it can also be removed easily.
No supports are necessary, but you might need a raft or brims to print in the standing-up position. The pictured prints are all .4mm.
- Update Feb '19: These were used all season and they work great.
- One inspector had an issue with the 2-way holder. No one, including the state level inspectors, has complained about the 1-way holder.
- Make sure you print this with a dense infill if you want it to hold up during competition.