Universal 21mm Replacement Ring for Phone Mounts

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Tired of those annoying phone holder rings that always crack or lose grip?
Here’s a replacement tightening ring (Ø21mm inner diameter) compatible with most common phone mounts and holders.

Designed to perfectly fit standard 17mm ball joints, it ensures a solid, reliable connection for your smartphone mount — whether you use it in your car, truck, or motorcycle.

If the dimensions don’t match your specific holder, you can easily scale the model up or down in Bambu Studio to achieve a perfect fit.

For best durability, it’s recommended to print in ASA or PETG, especially for car interiors exposed to heat and sunlight.

⚙️ Specs:

• Inner diameter: 21mm
• Compatible with most 17mm ball mount phone holders
• Easy to print, no supports needed
• Strong and flexible design

⚠️ Disclaimer:

Always verify the size before printing. This part is a user-made replacement and not an official accessory.