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@Batwell - thanks, you're on the money. It turns out it's all working just fine and apparently just set itself up. No need for all the malarky in the UG. That'll teach me not to RTFM. :topsy_turvy:
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That is an ITEM profile. If you nip over to their site they have CAD downloads freely available. Here's the one you show in .dxf to get you going.

You're entering the field of "XY Interpolation". I wouldn't worry at this stage about whether the XY motors step individually or at the same time - that's way down the road and when you understand...

Interesting project - just had a bit of a play and here's a pic of a "nautilus" I knocked up in Rhino.

4 clues... you said...

see how its rounded the edges of two of the corners but not of the other two?

only thing ive changed today is... .... and ive increased the acceleration on X

looking...