Fiido T2 Rear Wheel Axle Nut Cap

Description

A 3D-printable replacement for the black rubber protective caps fitted over the rear wheel axle nut on the Fiido T2 longtail cargo e-bike.

One of the original caps came loose during a ride, so I decided to recreate it in Fusion 360 after eventually recovering the missing part.

The model is based on measurements of the original rubber cap and the rear axle hardware, with an attempt to reproduce the original shape, including its hexagonal base, curved transition and rounded top.

The cap helps protect the exposed axle threads from dirt and moisture and covers the protruding metal hardware, reducing the chance of accidental scratches or contact.

Printing recommendations

• Material: TPU (95A recommended)

• Layer height: 0.2 mm

• Walls/perimeters: 3–4

• Infill: 15%

• Supports: Not required, depending on orientation

• Colour: Black, for an OEM-style appearance

TPU is strongly recommended because the original component is flexible rubber. A rigid material such as PLA or PETG may not grip the axle nut as effectively and could crack or become dislodged under impact.

Installation

Simply push the printed cap over the rear axle nut until it sits securely.

Check that it fits snugly, does not interfere with the axle hardware and cannot easily fall off during normal riding.

Depending on your printer and TPU filament, you may need to adjust the fit slightly.

Important notes

This is a non-structural protective cover only. It does not secure the wheel, replace any axle hardware or function as a passenger footrest.

Always ensure the rear axle nut is correctly tightened before riding.

This is an independently designed replacement part and is not an official Fiido product.

If you print it, I'd be interested to hear how well it fits and whether any adjustments are needed!