CAUTION: Use at your own risk! I printed mine in Markforged Onyx filled with fiberglass so it's plenty strong, I don't know how normal 3D printed plastics will hold up.
I created this pedal extension for the folding and non folding pedal because the pedals were way too small for my large feet and I couldn't find any good larger folding pedals for the Brompton.
You will need:
4x M4x20 + washer -> for the folding pedal
4x M4x20 or similar + washer -> for the non folding pedal
Keep in mind with this design the reflectors will be blocked. I could make a design with the reflectors but I don't see really a use for those tiny reflectors on the pedals personally.
Print with supports in the standard orientation for maximum strength. PLA is not recommended!
The author hasn't provided the model origin yet.