[Solarbotics] have shared a video of their DIY wire spooler ... Both spools are motor driven and the speed of the source spool is controlled by the position of the tension bar.

[Solarbotics] have shared a video of their DIY wire spooler ... Both spools are motor driven and the speed of the source spool is controlled by the position of the tension bar.

Elsewhere, magnetic particle brakes control wire-spool tension ... the most expensive method of controlling tension. Web spreading and anti-wrinkle devices abound, and curved axis or bowed ...