If you're using an orange squeezer like the one pictured, it's common to slip and have your fingers end up in the gears - especially if your hands are wet.

This orange holder has a guard and a solid handle to help your grip.

It's parametric, so open the scad file in Openscad and enter the radius of your orange.

Render and export an stl to print.

--Fresh orange juice without mangled fingers :)