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Road Bike Seatpost Mudguard

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Minimal rear mudguard that clamps to 27.2mm seatposts with detachable flap designed for printability.

Aktualizacja u źródła: 24 mar 2024

Informacje o modelu

Previously I was using a 3D-printed a**-saver style mudguard that fits into the back of a saddle, but felt that it had some issues:

It was too short to prevent wheel spray from reaching my back, and its length was limited by print volume.
It didn't protect my bike light which was attached to the seatpost.
It was zip tied to the saddle rails, limiting how much you could move the saddle and also making it cumbersome to put on/take off.

This design is my attempt to solve these issues.

The design features:

A ‘collar’ piece and ‘spacer’ piece that clamp to a 27.2mm diameter seatpost using 2x M3x25 screws and 2x M3 locknuts. This piece can be slid onto the seatpost when it is removed from the seat tube, or it can be clipped onto the seatpost with the spacer piece removed, then clamped in place.
An ‘arm’ piece and a ‘flap’ piece that are permanently joined with 2x M3x8 screws and 2x M3 locknuts. These can also just be superglued together.
Room for a M5x30 Flathead screw and M5 square nut to allow the combined arm+flap to be easily removed by removing a single screw.
NOTE: The arm, flap, and collar can all be superglued together if you don't plan on removing the mudguard often, so the only required hardware are the 2x M3x25 screws and 2x M3 locknuts.

I recommend printing these in something like ABS or PETG for their superior mechanical properties compared to PLA, but PLA is not a bad option for this design. Do be careful about clipping a PLA collar piece to a seatpost, as it may snap more easily.
The ‘flap’ piece is quite long and requires a 250x250mm bed. I found that shortening it reduced the performance of the mudguard significantly, but you can attempt to scale or trim the part to fit on a smaller bed if necessary.
These parts aren't difficult to print by design, but take care that the overhangs from the nut slots print well, otherwise the nuts may not seat well and can cause the layers to split.
Recommended slicing setup in photos.