3D Printer Switcher

When the number of printers increases, I want the changeover switch.

However, a commercially available USB switcher is useless. For a single printer, only configurations with multiple CPUs are considered.

So combine the parts here. This completes the switcher dedicated to 3D printers.

Switching software is troublesome, but hardware switching is quick.

As a result of trying out variously, this configuration is the cheapest and reproducible.

[ 2020.6.1 ] Unfortunately, with this con