Diffuser that simply slips onto the movable head of the Olympus FL-LM3 unit that comes with cameras such as the OM-D E-M5 Mark II.

The design is based on https://www.thingiverse.com/thing:3060393 by snapwithdale. I tried that one but the thickness caused the flash intensity to be diminished and my E-M5 II could not compensate. After chatting with him through comments, I measured his product and replicated it as closely as I could in Fusion360.

I printed this in "vase mode" to get it as thin as possible, standing up with the closed end on the bed. Although it's thin, it has not been damaged living in my camera bag. I have actually not used it much. If you print this, please let me know how it works for you.