Experimental Section
The open-source colorimeter case design was wholly completed in OpenSCAD [34], a freely
available, open-source, script-based solid modeling software in wide use by the 3-D printing
community. The design of the case body is shown schematically in Figure 1(a). The assembled case
with electronics is shown in Figure 1(b). The case was printed withblack polylactic acid (PLA) media
so as to minimize stray light inside the detection area. A RepRap 3-D printer was used to produce the
print after slicing the OpenSCAD-produced stereolithography model (STL) with the open-source
Slic3r software