Notachi update T2

Did you miss me? So, finally the torsion spring version of Notachi have success. I've been able to fire all primers I have. The overall design is much simpler than the torsion springs version. Less parts to print, easier trigger pull. Most parts could be printed of PLA+ (except the barrel assembly and the breech plate). Aw, well, also the grip printed of TPU.

Use general-purpose torsion springs (e.g., from AliExpress). Specs: 1.4mm wire, 8mm OD, 2+ coils (90 or 120 degree bend). One "left" spring and one "right" spring. Free end length: ~17mm. Note: I used a double torsion spring and cut it into a "left" + "right" pair.