Bicycle Top-Tube mounted phone holder
thingiverse
I designed this for my vintage peugot road bike so It is made for cylindrical top tubes but will fit larger or smaller profiles if you put a bit of rubber to fill it out or just extend the bolts holding it snug. I used 31mm M5 nuts and bolts but Anything close to that should work. Slot the nuts in the top piece and screw the bolts in through the bottom piece. Its made for a Razer Phone so it's quite large but it was really tight around my phone so I'm sure it will fit most similarly-sized phones. I used a hair tie to secure (in the groves). About 40% infill is enough.
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