A simple fully 3D printable flash diffuser for macro photography. My setup is Sony A6500 + Sigma 105mm + Godox V860III. For the diffusing sheet I used PET-G 0.3mm, the "screws" are 3D printed using TPU.

For better light diffusion, I glued a sheet of aluminum foil to the inside — the regular kind used in the kitchen — after first crumpling it.