Atlas 3D customisations

some parts I modified to save printing time and filament:
* HexagonBody - it saves filament, printing time an screws
* Nema14Adaptor - helps to fit a NEMA14 Stepper in the original case
* Fabscan_HAT_Top and Fabscan_HAT_Base - housing for Raspberry B+ with [Watterott Fabscan HAT ](https://github.com/watterott/RPi-FabScan-HAT) (power connector monted on top of PCB), case is based on [thing 922740](https://www.thingiverse.com/thing:922740) use M2,5x30 to screw it together with 4x spacer betwen