Resolve license discrepancies
The license for this repository is CC BY-SA. @eric.spivey has contributed an OpenSCAD file that he has licensed GPL 3. These licenses are not fully compatible (see https://www.gnu.org/licenses/license-list.html#ccbysa).
I am no expert on licensing, but my understanding is that GPL 3 should be used for software and CC BY-SA should be used on artistic or educational works, but not software (https://creativecommons.org/faq/#can-i-apply-a-creative-commons-license-to-software). So is a .scad file software, or art? For reference, many works on thingiverse, including .scad files, are licensed CC BY-SA.
@cahfofpai please chime in if you have opinions on this.