PublicLab Spectrometer evo 2

An evolution of the PublicLabs Lego Spectrometer - slimmed down from the block/brick design and with an extra insert to support the CD sourced diffraction grating. The base keeps the body and cuvette holder closely aligned, and the lid should minimise light leaks!
Implementation follows the Public Labs model. https://publiclab.org/wiki/lego-spectrometer

This was made with Tinkercad. https://www.tinkercad.com/things/ftzQfsURk1l

27 March : added a couple of alternative holding pieces for