I designed these 2 custom pieces as a remix for the MX Master: a thumb button support and a wheel click button.

These were designed to avoid modifying the original mouse casing, so they are meant to be fitted with some slight adjustments.

These are small parts, so print settings might need some testing on your end. - You'll likely need to file down the center button slightly for a perfect fit. - I printed these a while back, so consider these "as-is" files.

Happy printing!