In the low cost microscope the step for assembling the illumination has the spacer back to front.
https://build.openflexure.org/openflexure-microscope/v7.0.0-beta1/low_cost_microscope/illumination.html
The spacer should be the other way around. In the configuration shown by the picture it doesn’t fit due to the c2 capacitor on the illumination PCB being in the way.
Yes, you are absolutely right about that. It is noted in issue #293 in the repository.
The corrected instructions are not yet fed through to a release, but it is in !325, the view app link will show you the modified instructions.
view app