Rostock Halo Light V1

Used 6 x 6 magnets. You will need to glue them in place!! Mine fit tight. The 80mm light ring (https://www.amazon.com/gp/product/B00K81B974/ref=oh_aui_detailpage_o04_s02?ie=UTF8&psc=1) also fit tight. may need to file the edges of light. Notice that the magnets are next to the screws on the washers.

Caution: Glue magnets in place!! I had a failed print and I think it was due to the magnets coming out.