Accessory mount (26mm) for 50mm bike tube frame (e.g. recumbent)

This is a clamp to mount devices meant for a regular European bike on a 50mm tube-shaped bike frame. You will need a rubber O-ring with a diameter of about 40-45mm to attach it firmly. I also recommend a few tiny drops of hot glue or a thin sheet of rubber when attaching it, to prevent rattling.
The design also features two small cable guides at the left side.

Print Settings

Supports: No
Resolution: 0.2
Infill: 18%

Notes: 

There is an STL provided with built-in support for FDM printing which can be easily removed after printing. I recommend to use that and disable automatic support in your slicer.