Customizable Detector Cap Check Source Holder

Customizable version of a check-source holder / detector cap I made for using with our HPGe detectors. Note that no extra tolerances are hard coded in - you should add the necessary amounts for your printer. Don't forget to consider thermal expansion (contraction) of your material if utilizing for an HPGe or similarly chilled detector.

Parameters (mm):
$fn = resolution
cap_height = total depth of cap
inner_diameter
face_thickness
standoff_width = width of ring around the inner perimeter - meant to keep the source from contacting the fragile window on some detectors.
standoff_depth = depth of standoff (see above item).
sidewall_thickness;
source_diameter = diameter of hole in which the button source presses into
source_mount_depth = depth of hole the source presses into
through_hole_diameter = diameter of hole going through the face - meant for being able to pop the source out.
breather_holes = True / False - small holes for equalizing air pressure, to help protect the d