Photoreactor

This is a photoreactor with four high power LEDs that was designed for visible light applications, in particular photoredox chemistry. It fits a standard magnetic stirplate and can accomodate up to four 20 mL screw neck vials simultaneously. Designed to be inexpensive, easy to print and assemble, it can be built from readily available components for EUR 100 or less.

*Update March 10, 2020*
The lid has been updated with slightly thicker clips. They tended to break in the original design. I'd also like to mention that I used [Labsolute ND24 vials, 57 x 27.5 mm](https://www.labsolute-chemsolute.com/en/products/product/itemnumber/7612150/) with screw caps with septa to design this.

I printed and tested this with four 10 W blue LEDs (450 nm wavelength) but other types and wavelengths should work too. Using the 10 W LEDs shown here, an 80 mm fan must be used with the fan duct in order to avoid heating the reaction vials above 30 degrees C. If lower power LEDs are used it may be possi