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Wow, I had no idea they could work without a blip box permanently in range, that's pretty cool. I guess you just need to figure out how to get hold of some (and maybe some spares in case they run out of battery at an inopportune moment).
I love that there is a 3D printed solution for them already!
Just one last thing on disconnecting and packing into a box, I presume you aren't disconnecting brakes etc? If it's just the extensions then depending on where the Di2 junction box is, likely you'd only need to unclip one or max two di2 cables, and that's it. In my setup it's just the one...
onyerbike
Been doing some reasearch, and it seems the blipbox hiding issue can be solved. I was aware of these wireless blips, but didn't do much reading before: https://www.slowtwitch.com/Products/Components/The_Low-Down_On_SRAM_s_99_Wireless_Blips_8220.html
$99 a pair, but they seemed rather unsuitable as bar end shifters (clearly not what they were intended for). Seemingly, you need a Blip Box to initially pair, but after that, it is not even necessary.
I was trying to think of how they could be better adapted for extensions, but it seems a wonderful person has already done it:
https://www.thingiverse.com/thing:5335609
If I understand this right, this means that once you have paired them, you can leave the blipbox/primary shifters at home/give it back to the person you borrowed it from, and then you have truly wireless shifting from the bar ends?