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@kiskubai
Somewhat finished the Di2 project for the TT bike. Still need to print and connect the TT extension switches, but the basebar ones work as intended :)
Short summary:
I gutted a broken GRX shifter for the Di2 gubbins, and opened up the shifter part. Soldered on my own cables to the logic board so I just have to close that circuit to shift up/down.
I was very afraid that my soldering skills wont cut it, but it worked out. As its all very brittle, I 3D printed a housing and poured out the entire thing with resin.
Pulled in my own wiring to the frame, and soldered all remaining connections. Currently its all just shoved up the seatpost, but Im planning to 3D print another case that slips up and secures there.
Used my own wiring to connect the rest, with a combination of:
-Di2 cables cut in half: 1-1 half for each derailleur, and another half to connect it to the rest of the system)
-2 full cables: battery to junction, junction to shifter brains in seatpost
Current look
Still a lot of things to do:
Tidy up cabling, heatshrink on red-black wires to make them look nice
3D print and connect TT extension switches
Glue tubs
Will take pics of the printed switches etc when the whole thing is done. But it works, and thats all that matters for now :D