Bicycle Frame C-clips (6.6 mm and 5.65 mm widths)

A considerable number of bicycles use C-clips for attaching externally mounted cables and sometimes wires to the bicycle frame, typically for both the brakes, and the derailleur. While they aren't especially challenging to design, the sub-3 mm thickness adds a couple of extra things to consider.

1. With regard to strength, in order to remain flexible enough to operate, the C-clip needs to be as thin as possible while remaining strong. The stock clips on a number of bikes come in at around 1.8 to 2 mm thickness. Thankfully, even PLA seems to be more than happy to flex at this thickness.
2. Due to 1 above, you will most likely be dealing with 2 wall loops, and no infill. If you want to print a bit slower or increase the flow rate slightly to ensure empty space is filled more reliably, then I can certainly recommend it (though it may not be necessary.) Not doing so may result in layers separating when you bend the clip to attach them to the bike. While it may still function, I can't predict what effects this will have on longevity.

Regarding the width of the clips, mass produced replacement C-clips tend to be a bit wider (around 6.6 mm.) You can buy these types of clips on Amazon in bulk, but these will print in the same quantity faster, and you probably won't need to replace and entire bicycle worth of clips anyway. Some manufacturers may use C-clips with a smaller width depending on things like hole size, paint thickness, etc. I can confirm that at least Kona uses a width of 5.65 mm instead of 6.6 mm. That's the reasoning for the included widths, but if you'd like to request other widths then feel free to ask.

Printing

As usual, I recommend applying a layer of 3D printing glue to your print surface as the parts in question are quite small. I printed in PLA, but I see no reason that any other material would have issues. No supports are necessary. Print them on their side as modeled.