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I found out I had a minor diameter / radius confusion going on, with the chainstay at the right dimensions it all looks a lot more confidence inspiring. Which makes it a far safer bet than 3D printing stuff, given I was operating on little more than "twice the wall thickness of the tubing should be fine".
As much as I would like to have some 3D-printed part in there I can't come up with anything where it would be better than traditional fabrication methods.
I'm toying with the idea of having the non-driveside dropout 3D-printed. It's roughly a Paragon snapring dropout with paragon caliper mounts all blended into each other as a rough mockup. Price on this would be €70, I'm still buying a set of dropouts to use the driveside bit so no savings there, but it would save me roughly €20 on caliper mounts. So all in all it wouldn't be hugely expensive when taking into account the overall price of the build. It's a bit tricky if it will hold up though, I've doubled the wall thickness of the tube over the Columbus spec, but still. Would like this:
And as is, it's not a lot more exciting than just welding the caliper mounts in the tube.
But I'm hesitant to go over the top with styling, as it will clash with the rest of the frame. Thoughts? Example of good-looking 3D-printed dropouts? I saw these earlier which got me thinking about this, but not sure if this look would work on my bike.