Adderini - Rubber Powered "Roller" Upgrade

cults3d

I wanted to have a set of rubber powered limbs that protected the rubber as much as possible. The idea I came-up with was to add an outer layer to protect the rubber as well as integrate free-spinning rollers similar to the ones used on the bowstring guard rollers to minimize friction. I tried to match the original rubber powered limbs as best as possible by re-sketching the limbs themselves. I then modified the rollers as I saw fit. Personally, I use surgical tubing rather than bands; and I double-them-up by folding them over themselves. To maintain proper alignment, I made the rollers more bulbous near the centre - based on Steve Mould's video regarding rubber, constrained to a path, under tension https://www.youtube.com/watch?v=TNuzi-jMXoY&. I had originally designed the arms to secure the surgical tubing using zip ties, but I think either I was too optimistic or that 2mm thick zip ties do not provide enough force/friction to secure the tubing - unfortunately they came loose after shooting a whole magazines worth. I think, rather than basing the design on the original arms, I may need to re-design it completely to accommodate my desired end features OR just beef-up the arms. Furthermore, as I might abandon this project, I have decided to provide the STEP and F3D project files in addition to the STLs. Do be warned, however, I am not a product designer and am self-taught, so the F3D project file timeline is quite messy.