Part in reflection_illuminator.stl not used in build instructions
Following the instructions at docs/3b_illumination_reflection, the user is told to print the reflection illumination STL. This STL contains three parts: the condensor housing (bottom right in the image below), the illumination holder (top) and some unknown part (bottom left, circled in red).
The instructions do not state what the bottom left part is for. I found the reflection illumination part works perfectly without it. Could anyone elaborate what it is for, or remove it from the STL?