I recently built a fountain for our (roughly 1/8 acre) pond and thought it would be cool if was lit up at night.

https://www.thingiverse.com/thing:4511898 (<-- Pond fountain design for those who are interested)

I was not crazy about doing a ton of electrical work for something that was basically being sprayed with water all of the time and having to wire it to 110V with a voltage converter to get it to the correct voltage of the LEDs etc... I decided to look into a solar light that was already rated to be outdoors/was waterproof and would come on when it got dark automatically. I eventually decided on this:

https://smile.amazon.com/gp/product/B07KP8GJVZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I modeled and printed this bracket to hold the light onto the 4" PVC pipe that makes up the frame of my floating fountain. I used 10-32 stainless hardware with nylon lock nuts to prevent anything from loosening up due to vibration etc. My frame was built with 4" sewer and drain PVC (slightly smaller diameter than standard schedule 40) and you can see in the picture that I added some silicone strips as a barrier between the bracket and the pipe. This helped increase the diameter of the pipe slightly and create some space that allowed the tightening of the bracket. If this was used on standard schedule 40 pipe, it should be a perfect fit without using buffer material. This was designed in inches, so if it shows up tiny in your slicing software, multiply the scale by 25.4 to convert it from inches to mms. Let me know if you have any questions and post those makes!

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