I also found these which I think might be ok - Mouser No: 490-CUI-3132-1FT Mfr. No: CUI-3132-1FT But they are not long enough. There is a 6ft version that might be ok too: Mouser No: 490-CUI-3131-6FT Mfr. No: CUI-3131-6FT But I am not 100% sure they are the same, someone would need to look up the datasheets on these which are available on the mouser site for each item and look at them.

OK, I think I've worked it out a bit more - if others are in the same boat, crimping and creating the cables isn't too complicated, though it requires bloody expensive crimping tools from some searches I've done. Here's a video on crimping molex connectors - https://www.youtube.com/watch?v=ofh998RCBY0 I guess you just buy the molex 50-57-9405 connectors and little metal inserts from your country's specialty supplier and make up some wires yourself with fine pliers.

If cost is an issue like it was for me in Australia, maybe try your local engineering supplier. I was looking on ebay and aliexpress at first... our local supplier was actually a lot cheaper, statewide bearings. I got 10ft of it for $30, it was over $100 from other places

GT3 and similar belts stretched too much? Surprising, I read they are industry standard for some CNC and regarded as a rigid link

Do you know of a good place to source the 04B chain or an alternative? I couldn't find it on aliexpress or ebay cheaply, though there were other chains. Plenty on UK ebay but loads of delivery charges and the currency issues there too. All the bearings I got off ebay and aliexpress too, I'll start searching for the electrical stuff tonight, takes a while. Do you have any videos of your robot? Cool to see another person in Aus making one. edit - Got a source or alternative for these at all? "AMT102-V encoder", cheapest I can find is $40 each and you need 6 for the AR3

Thanks a lot Paul, it did help with the screws. I had a different number to buy to the spreadsheet though, I'm guessing since I went by the AR3 part manual.

Hi Paul I notice you're in Australia too. Could you recommend any suppliers for all the bits required in our hemisphere? I have just ordered the stepper pack from stepperonline.