Which material do they recommend using?
Discussion
From docs: Material choice is PLA+/PLA Pro, from reputable brands like Polymaker or ESUN. (Note: the PolyTerra line of filaments will yield a structurally deficient frame, one user reported 4 shots before the frame broke.) Exotic filaments like Nylon, Nylon+CF/GF, Polycarbonate have reported mixed experiences so proceed with caution.