For example, a "cheap" 1" notch filter from Thor would run about $500, whereas a kinematic mount would be somewhere closer to $40.
Also, Raman typically is very weak, roughly 10^-6 of the laser intensity. The CCD/CMOS has to be low dark count.
The things is, if you have spent $5000 on components, why should you save couple hundreds of dollar on good optical mounts?
This 3D printed plastic base/structure will never have good stability and precision for any serious scientific application.
As far as a decent scientific bench instrument goes, we're mostly in agreement. I'd love to know if you could make a decent optomechanic system like this on a SLS with a metal substrate.