I designed several of these from scratch although they all look fairly similar, of course. I specifically wanted open ended slots for the LEDs to maximize the light out and I printed them in white to reflect light.
The smallest is 66mm in diameter, the same as the router, so that it will fit through the 611 router mount without being removed.
Then I designed one that is 90mm in diameter so that it would maximize the area to divert the air. Maybe not an absolute necessity but useful for those people that are never going to remove the router.
Then I designed one to hold a SuperEyes microscope to use for spotting and centering, also mostly 90mm in diameter.
I'm planning on putting these in an online store as soon as I figure out how to use Weebly and if that doesn't work, then I'll change to Shopify. It is going a little slowly as I'm an engineer, not an online sales and marketing guru.