Is there some more info? What else do you need, other than a spool of not-PLA? How much does it cost? Where can you source the other materials?
[1] https://la3emedim.fr/assets/SMALLEST%20-%20README.pdf
[2] https://docs.google.com/spreadsheets/d/1XXZB4jRtvtlDIqlR69C0FRri8x8lZDpxO6ZGnSp3L2Y/view
Basically anything but PLA will work, PETG will be the best difficulty/cost compromise.