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Hmm the plot thickens
Like @Jonny69 indicated, you could be looking at a design for AM challenge here... The printed part could be literally any shape you can model.. I’d be inclined to put a couple of M6 thread inserts into the locations dictated by the caliper so they’re hovering in free space and then work out the most efficient way to tether them to the frame
Rik_Van_Looy
Tijmen
Yes! I looked at doing a full dropout, but it gets both pricier and trickier. With the brake adapter I'd just print it solid and hope for the best, but with a full dropout you'd need to get into those lattice structures and making sure it's strong yet light. And then paying for somebody else's expertise gets even more expensive, as the Reynolds dropout shows.
The mounts on the previous page would in theory be self jigging as I had cut the tube facing faces 'to size', that combined with a disc brake alignment tool should be safe. This has become far more interesting now I've discovered a conventional mount wouldn't work with my current choice of seatstay and chainstay. The blue faces would need to touch a tube.