Clip-on rear fender for seatpost
A seatpost fender stops road spray soaking your back on wet commutes and clips on without tools. The fender blade is 300 mm long, 70 mm wide with a 60 mm radius curve to shadow a 700c tyre, 2.5 mm thick, and joins a snap clamp for a 27.2 or 31.6 mm seatpost with a 1.5 mm gap so it flexes open. Printing the blade at a slight angle across the bed keeps it in one piece, and PETG or ASA keep it from going brittle in the cold.
With SpeakCAD you generate a fender for your seatpost diameter and tyre width in one go and adjust the length or the clamp tightness through the chat. It is free to preview in the browser and only costs credits when you export.
Make a clip-on rear bike fender with a 300 mm long blade, 70 mm wide, 2.5 mm thick, curved to a 60 mm cross-section radius, and a snap-on clamp for a 27.2 mm seatpost with 3 mm walls, a 1.5 mm opening gap and a 25 mm stem connecting them.