This a modular housing for standard optical mirrors (25.4x25.4x1.3 mm) used in spectroscopy.
Mirror holder volume: 41x41x33 mm.
Solid sample disc adapter must be resized to a factor of 0.9 in order to fit the slit properly.
Sample disc adapter volume: 9x27.9x48.6 mm.
Additional plate support for other mirror sizes and geometries (elliptic, rectangular and circular mirrors).
OpenSCAD source file: https://github.com/valba/Modular_Mirror_Housing.git
Source code is parametric, so you can easily resize, modify, distort every detail of this housing to best suit your needs (ie. to adapt it to a different mirror size and geometry).