If I were building from scratch I'd definately be going for the AXBB-E and UCCNC software combination rather than my current parallel port and cheap BOB combo. I have spent a lot of time fault-finding on that in the past and am not impressed with my failure to see the real cause before. But as that's what I have and I'm used to LinuxCNC and I've had it all working correctly in the past so I'm going to stick with it for now, though I have recently checked what the delivery time to Australia would be. The local supplier's markup equates to an arm and a leg so I would not use them. If this hobby turns into a money spinner in my retirement then an upgrade to a more reliable system would be a sensible investment.

Having seen the amount of noise present on the earthed case of my controller and everything inside it when the VFD is running I'd want a filter on the mains to protect everything else nearby. For $35AUD it's an easy fix (fingers crossed) though they want $40 for a simple aluminium box to put it in!! I've gone for a 10A two stage filter very similar in design to the one Muzzer linked to. RS are sending it from the UK so many readers on here could have one sooner than me if required. It's this one... https://au.rs-online.com/web/p/power...lters/1863517/

As I mentioned before there is no filtering on the earth cable and interference at high frequencies can escape via this route. There is no such thing as an earth at radio frequencies. Muzzer mentioned clamp-on ferrites as good for RF supression and one option for a filter I plan to test out is simply three ferrite rings with the live, neutral and earth wires into the VFD threaded through one each. This would prevent the spurious tripping of earth leakage breakers which can occur with conventional mains filters.

Kit