Roll bender

One of the activities of our team is the teaching and development of experiments for STEM education in [Uni for kids](http://uni4kids.bg/) . And one such experiment was an experiment visualizing how the hadron collider works and how the solenoid works. So, as a result, we have that:



But for the development of this experiment, we need a roll bender. Unfortunately, there is really hard to find a small one and a cheap one, so after some googling we find [this](https://www.wcwelding.com/rod-roller.html) and later [this one](https://www.thingiverse.com/thing:835165)

And after some designing and development, we develop own version of this tool that is robust and 3d-printable.


#### BOM
- 4x bolts M8x55mm (for passive rollers and top mount)
- 2x bolts M8x35mm (for handle)
- 1x bolt M8x85 (for active roller axis)
- 1x anchor bolt (for the slider, this bolt must be filed as shown on im