I've made a number of ring light based illuminators for my equipment and for quite a few others who have requested the either the 3D printed mounting or the STL file. Ring light post
A few things worth doing :-
Remove the plastic diffuser to leave just the PCB substrate and LEDs. The glue holding it in place is brittle and easily pings off. The light quality will be greatly improved.
Chose the largest diameter ring you can find – 120mm seems to be the most common.
Which ever style mounting you chose don't make the ring sit concentric with the spindle but offset it to the front of the spindle. Without this you will have a symmetric shadow when working with very short tooling.
Glue a strong magnet to the back of the in line power supply so it can be attached to the machine body out the the way.
On my 3D mounts I also stick a baking foil backing with double sided tape to increase reflectivity.
If anyone wants the 3D print STL file customised to the diameter of your spindle send me a message with the hole diameter required.