Hey David,
Glad to see you liked peeking at that printer. Will admit - I had NOT Even noticed that only 1 print head was high Temp - I agree - that is Stupid and Foolish to have done that!!!
Also - and I may be wrong about this - but, I don't know if it's considered a TRUE IDEX - like the Essentium printers - which Were. Since - a True IDEX means that the 2 extruders are TRULY Independent! As in - if Both extruders are on a single gantry - they are not Trully independent. But, yeah - the idea to do Copy mode - or Mirror mode - is a GREAT Advantage to a printer like this!
That being said - there is a VERY Inherent issue to IDEX machines. We were diving DEEP into this issue at Essentium - before the co. imploded - and I had been involved with it.
The PROBLEM? You can NOT Properly do Mesh Bed Compensation. And, the Bigger your Bed - the great potential for Deviations across the entire bed. I could go into details - but, I suspect I don't really need to do that - since most folks in this forum already have full knowledge on Mesh Bed Compensation - How it works - and Why it is needed!
Just sayin'...
-K