This is a threaded storage adapter designed to press into a bike crankcase hole, turning unused space into a compact storage compartment for small items.

The design is made for a 23mm hole, but can easily be scaled to fit other sizes depending on your application.

The system uses a 3-part threaded design consisting of:

A press-fit threaded insert
A threaded storage tube
A press-fit end cap
The insert presses into the crankcase opening and provides the female threads for the storage tube. The tube then threads into the insert, creating a removable storage compartment. A press-fit cap keeps dirt and debris out while helping protect the contents stored inside.

The threads are designed specifically around the included print settings, so using the provided print configuration is strongly recommended for proper thread fit and smooth operation.

Parts to Print:
1 × Threaded Insert
1 × Storage Tube
1 × Press-Fit End Cap

Additional Hardware Required
None required (fully 3D printable assembly)

Print Settings:
Printer: Creality K2 Pro
Material: Creality Hyper PLA
Settings: Use included print settings for proper thread quality

Supports: None required unless otherwise specified in included print setup

The included print settings are important to ensure the threads print cleanly and engage smoothly.

Assembly:
Press the threaded insert into the crankcase hole.

Install the press-fit cap into the end of the tube to help keep the contents clean and protected from dirt or debris.

Thread the storage tube into the insert until fully seated.

Once assembled, the storage compartment can be easily removed and reinstalled as needed.

Notes:
Designed for a 23mm crankcase hole
Model can be scaled for other hole sizes if required
Using the included print settings is recommended for best thread performance
Fit may vary slightly depending on printer tolerances and material used
If threads feel tight, lightly running the parts together a few times will help break them in

Bike Crankcase Storage Adapter

0.12mm layer, 4 walls, 50% infill