I really liked the AMS Riser with LEDs that T3CHKOMMIE created and was going to make one myself, but then I found a cheap LED Ring Light (made by Tech1) at a Dollarama (Canadian dollar store) for $4. I decided to remix the LED holder portion to fit the LED ring from the dollar store light instead so I wouldn't have to source the separate parts or piggyback off the AMS for power. 

Surprisingly the USB-powered Tech1 Ring Light is very bright and even has a built-in controller to adjust the colour temperature and brightness.

I've also uploaded my step file in case anyone wants to tweak this for themselves. Like with T3CHKOMMIE's step file, the Foot Pads are contained within the Riser and Lamp object so beware of that.

Notes: 

• Assembly instructions are included in the download files. 
• Print the “Lamp” upside-down and enable build plate supports (only needed under attachment points)
• Print 4x “Riser-Foot-Pad” and 2x “Lamp-Foot-Pad” in TPU. The rest I printed in regular PLA.
   

Here are a few Amazon US links to LED ring lights that will almost certainly work as they are the same size and look like the same light sold under a different name:
One, Two, Three