Cant you just buy a R785 groupset?
Individual Di2 parts arent cheap. Plus the cables, charger, Junctions, battery, etc. all get pricey bought seperatly.
You can pick up parts cheap if you keep you eye out.
External battery and sw-67 junction can be had very cheap for example.
Managed to get a 1x11 setup for under £300
@Smallfurry started
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Cant you just buy a R785 groupset?
Individual Di2 parts arent cheap. Plus the cables, charger, Junctions, battery, etc. all get pricey bought seperatly.