The diameter of the rotary module only extends to 63mm. This extender allows you to simply slide it over the 3 arms on the rotary module, and extend the radius out 10mm or 20mm (diameter extension is 20mm or 40mm). Simple and effective. Available in Adobe Fusion f3d for any modifications you want to make, OBJ, and STL for both sizes for immediate printing.

I used this to laser engrave water bottles with a diameter of 88mm.

The latest version 5 allows you to extend the rotary module fully from open to closed.