My drum lamp came without a diffuser, so it had too much glare, but now it’s LIT with custom printable light diffusers. Simply update parameter: Total Diameter and the model will resize its 4 piece 1:3(:1) ratio design. (3)*120 degree identical pieces glue together with 6 tiny drops to form the halo, which supports a drop in center, and the whole thing floats on your lampshade inner rim. I printed with clear PETG, and recommend hex or even concentric infill at as low as 5%. The fibonacci ratio pleases the eye along with the reduced glare.  3mm thickness (parameter) seems perfect. Light with LEDs only for safety. 

Probably best for you to measure your lamp, update Diameter parameter(s) in Fusion, and print. STL that I used for my 3 drum lamp (drums are all diff diameters e.g. 303 mm, 317 mm, 328 mm) included.