Rear light mount for Kwiggle bike

Replacement mounting structure for a seat post rear light on a Kwiggle Bicycle rear fender. The original mount only fits one certain kind of light and is not sturdy enough. This was designed after the original mount broke in thin section on @nitram_4381331's bike.

• Fits the original two mounting holes on the rear fender

• Provides a short stub cylinder with 25 mm diameter

• Mount angle approximates the 18 º of a regular seat post

• Retaining lip on top forward side to provide more secure mounting for elastic bands etc.

• Recommend replacing screw with e.g. 10mm long button head (ISO 7380-1 M5 TX25) instead of the original one that needs countersinking

Recommended printing parameters:

• a suitable filament (I used PETG, but if the part will spend most of the time in sunlight, ASA/ABS may be preferred)

• 3 or more perimeters for mechanical stability

• 3-4 bottom layers

• 0.20-0.25 mm layer base height, but variable height recommended for surface finish and overhang (as pictured)

• print upright, angle slightly if needed

• STL is pre-angled to a point where the overhang should not be a problem, if you're using the STEP file, just angle the part to a point where the overhang is not a problem and then sink it in to the point where the locating pin is a full circle for better adhesion

• Locating pin does not need to be 5mm long, 2mm is probably fine if it helps you position the part for printing

Note: First Photo shows V2.3, other photos and screenshots are of previous revisions.

• V2.1 adds mounting surface thickness, a recess for a M5 button head screw (ISO 7380-1) and fillets and chamfers in multiple places

• V2.2 cleaned up details on top of the stub. The tiny sharp corners disappear in FDM printing.

• V2.3 replaces locating stud with hole of same dimensions as the existing one so the mount can be secured in place with two fasteners. This reduces vibrations observed in previous versions

Known issues: When folded the Light or stub might scrape the ground, exercise caution. See last photo.

Open source CAD project and STL/STEP. As per CC SA BY 4, commercial use is OK as long as attribution and source files/project (if modified) are provided. For other licensing options, please contact me.

The OnShape project is really messy as I was just quickly throwing things at it where I wasn't familiar with it until something stuck. So please avert your eyes to my atrocities if you are well versed in CAD.