This is a parametric handle for a bike. It can be easily be customizable in Autodesk Fusion 360, so it will fit every handlebar.
 

Modification instructions

1. Open .f3d file in Fusion 360.
2. Open Change Parameters window.
3. Edit Diameter and Length values under Favorites parameters.
4. Export created Bike Handle body as a mesh object.

Recommended print settings

• layer height: 0.2 mm
• infill: 10% gyroid
• perimeters: 2
• solid layers: 6
• avoid crossing perimeters: yes
• supports: no

Avoid crossing perimeters (combing) should be enabled to prevent unwanted stringing inside. Print it as it is - on the closed side.

For this kind of application, printing with TPU or other soft filaments is recommended.