Adapter to be able to use the front mudguard sold at Decathlon on a bike with a larger diameter tube. The credit of the lower part is to my friend Pascual (https://www.thingiverse.com/paskurt/designs), he's a FreeCAD artist.
You need to add one or two 5 diameter nuts on the top piece. In my case I have glued both nuts to prevent them from moving.
I recommend 100% infill because the parts will be subjected to strong pressure inside the tube. If they are not tightly fitted, the mudguard may come loose during riding.
The author marked this model as their own original creation.