I've made up some files for 2020 Aluminium that you can use in your projects.
The STL is available here.
The other versions are available on
https://grabcad.com/library/2020-aluminium-extrusions-1
(https://grabcad.com/library/2020-aluminium-extrusions-1)https://www.myminifactory.com/object/3d-print-93353
(https://www.myminifactory.com/object/3d-print-93353)https://www.thingiverse.com/thing:3623862
(https://www.thingiverse.com/thing:3623862)Hopefully, they will be of use to someone