Observation Mapper Casing

This casing is suitable for the 'observation mapper' see https://innodesign.io/tag/mapping/ for more details.  The design is an adaptation of the Fusion 360 – Easy Snap Fit Cases https://www.youtube.com/watch?v=VVmOtM60VWw

*Note: This file is part of the SySTEM 2020 project, which has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement no. 788317 *