PrismLume 3x3 and 6x6 base with convenience cavities

This is a modified version of small 3x3 and medium 6x6 bases by @crazy_format. It gives more room for wiring and also adds a cavity at the bottom to put your ESP2866/ESP32 module into. The wireless module cavity should fit any reasonably sized development board without metal pins, or any bare ESP module (which do not have any protruding pins at all). The edited OnShape version is here