This is a 3D printed support brace for the Work Sharp Precision Adjust mounting arm.
If you own this sharpening system you're probably familiar with the unwanted flexing when applying any pressure to a knife in the support arm. This brace eliminates the flex so you can maintain a consistent angle when sharpening!
This design also features a holder for a Sharpie, which is a commonly used tool to ensure consistent angles when maintaining a blade.