Stock filament counters aren’t always very accurate, but you can roll your own filament counter from an old mouse. [Bin Sun]’s build is based around an old ball-type PS/2 mouse, the kind with ...

There was a time when if you bought a USB mouse, in the box was also an adapter to allow it to be used with the older PS/2 interface. And if you were to go back a few more years into the past ...