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@Fibreglass
Just wanted to document this before I take it all apart to implement some different ideas that build on this.
The thing about building a Softride with Di2 that you don't really think about until after you've bought the Softride and the Di2 is where are you going to put the battery? I think the best answer is probably in the steerer. Shimano (via Pro) does make a kit to facilitate this, but as you can imagine it is not compatible with one-inch head tubes.
So I designed my own kit. It's printed out of TPU to provide some grip on the inside of the steerer and around the cable plug. It's not weather-sealed but it's probably close enough; the Pro kit doesn't provide any protection at all so I think it'll be fine. I intended the case to be held in place vertically by friction, but it turns out that the inside of the steerer tapers towards the bottom, so there isn't any risk of the battery falling out.
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