Can a KX3 be upgraded to USB?

[Ger21]

I would recommend the UC300ETH over the USB version.
In addition to better noise immunity, the ethernet version is also faster.

I'd also recommend switching to UCCNC from Mach3, while you're at it.

[Tramp92]

The KX3 sold by Arc Euro Trade comes with USB as standard. We had one where I used to work for test fixturing etc. It seemed to run ok.

[z3t4]

If you're looking for a used, parallel port KX3, then a look at the CNC4PC C11G parallel breakout board docs would be helpful. This is the BOB on (at least) the ArcEuro KX3s. If you want to replace it with a USB or ethernet board, in fact any other controller, bear in mind that the C11G has a 0-10v spindle-control output, controlled by a stepper signal, and you'd need to replicate that if you wanted software speed control.

If you want any more info about the KX3 I'd be happy to help.