Flex-E-Rex is a educational soldering kit. There is a full list of instructions, parts, and design files found within the Github repo.
More details found on the Github README page!
The 3D printed parts fall under Creative Commons Share Alike Licence and the PCB and other content of the kit fall under Attribution NonCommercial Share Alike (CC BY-NC-SA).
The author remixed this model.
Model was redesigned and balanced to accommodate the weight of a PCB and battery.