I decided to have the prototype of the frame block 3D-printed in a company near me. It cost about 80 euros, pretty expensive but I was busy and just wanted the project to move forward.
The material is nylon, PA. By default color would be whitish, but I wanted the frame block to be black to avoid internal reflections as much as possible. So the part was colored black in post production.
I’m very happy with the outcome. But there is also something left to be fixed. The input slit is not sitting in the middle of the aperture but is about 1mm off.
The sensor data sheet doesn’t define the slit location and it’s variation range. I should have checked this but I assumed the slit is accurately in the middle. I have no idea how much this can vary. I’ll probably remove one of the the frame block walls next to the sensor and get slit position set correctly. Well, not a big deal.
Here is the .obj file of the frame block for download. You can examine it using a 3D viewer or print 3D copies if you like. If you do please send me a photo 😉
Experimental Photonics 
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