UC2 - Thorlabs insert

This is the [UC2](https://github.com/bionanoimaging/UC2-GIT) insert that adapts a typical cage-system optomechanical component into our cube. The pitch of the rods is 30 mm.

It is made for components that fit on the rods with 6 mm diameter. However, every 3D printer is a bit different and when you print the insert the rods might be too big or too small for the component. In that case, open the insert in the Customizer and adjust their diameter by changing the offset (in millimetres).

The offset is a value _added to the diameter_ in the range of (-1 mm, 1 mm).

Find more about the insert in its [GitHub page](https://github.com/bionanoimaging/UC2-GIT/tree/master/CAD/ASSEMBLY_CUBE_Thorlabs_v2).