I have been working on a 3d printed case for my RAK4631 running Meshtastic. The goal was to make a very compact device. What you see below is the internal frame. Once the internal frame design is finalized I will begin work on the outer case.
Printing was done on an Elegoo Mars 3 with Siraya Blu resin. Power is from two 1200mah 4mm thick lipo batteries. I could make the device thinner by using one battery but it would mean using a smaller gps antenna. A later version may use IXOLAR 25% efficient solar cells. The RAK5005 main board has a solar controller built in so why not use it!