Brompton front rack
thingiverse
The tubes are 18-19mm carbon fiber tube, glued with epoxy. I printed the rack with 30% infill PLA. The fringe of the mount cracked when I tried to carry 5-6 kg stuff on it. Perhaps you may improve the model. I borrow the design from here: https://www.myminifactory.com/object/3d-print-bromton-front-bike-mount-73171 I guess the mount is the only weak point.
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