Hello,
i've been thinking about building my own ffb joystick too. But i want to go in another direction. Instead of building something super strong and powerfull, I would like to 3d print the mechanics and use widely available drive components (exact specifications are yet to be determined). This has the huge advantage, that everybody with a 3D printer can reproduce it cheaply. I've got quite some experience with control theory and embedded system design so i think i could do the electronics but i newer used one of this PLA and ABS extruding 3D printers and don't know if it's possible to print the mechanics. Please tell me what you think about this idea. I will post any further updates on the project in this forum.