These models are protective cases for the Modern Robotics controllers and ZTE Speed smartphone used in the FIRST Tech Challenge. Made by Team 4029, 2 Bits and a Byte, these cases reinforce the PowerPole and miniUSB connectors to ensure that wires do not lose connection during the Robot Game. The ZTE case uses a TETRIX MAX hub pattern.
During our first competition, we had some serious connection issues: over the five matches we played, the robot moved for about a minute total! While we didn't run into these problems practicing and driving during team meetings, the environment on the playing field was significantly more hectic. By designing and installing these cases, we have drastically improved our reliability; the robot has not disconnected during testing or in competition since they were attached.
IMPORTANT: All of these models are designed to work with the XY compensation feature found in Slic3r. This feature compensates for the width of the nozzle when extruding model edges, so without it 6/32 screws do not fit in the holes and, more importantly, it is significantly harder to insert the controllers into the cases.
Many paid slicer programs likely have this feature built in, and Slic3r has it available in the advanced settings.
The CPDM case is a little difficult to configure because the holes flanking all the USB cables must not be supported but rather bridged, but the top of the case needs support because the bridge is too long (unless you have a legendary printer).
The ZTE case should not use supports.