Design and build of a 3d printed Roskopf watch, Part 6, prototype with steel spiral

I am designing, 3D printing and building a replica of a Roskopf watch with 3D printing In this Video, I installed a steel spiral spring Testing timing in multiple position Links to books about the history of the original, including a detailed biography of G.F. Roskopf and a thorough study of his watch In French: http://www.watkinsr.id.au/buffatFr.html In English and with additional graphics: http://www.watkinsr.id.au/buffat.html I have learned a lot with this book: A Treatise on Modern Horology in Theory and Practice, Claudius Saunier https://www.google.com/books/edition/A_Treatise_on_Modern_Horology_in_Theory/1yVYAAAAYAAJ?hl=en Traité d'horlogerie moderne, Claudius Saunier https://books.google.fr/books?id=vX1JAAAAYAAJ&printsec=frontcover&hl=fr&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false Les Gravures en meilleures qualités https://www.cliniquehorlogere.ch/fr/news/traite-horlogerie-par-saunier.html