Diffuser for a Godox V860III Speed-lite

this diffuser is meant to be used with a Cannon R50 and a Laowa 90mm macrolens. It's dimensions are suitable for the flash unit mounted with a hot shoe adapter to the on top of the camera (see photos)

Three parts

The print consists of three parts: the main unit which is mounted onto the speed-lite, an adapter ring which will hold the diffuser plate and the diffuser plate itself.

The main unit has a large sleeve that will friction fit onto the speed-lite, and the adapter ring will friction fit into the main unit. The diffuser plate is meant to be glued into the adapter ring.

This way we can easily replace the diffuser plate + adapter ring without having to reprint the main unit. That might be handy if you damage the plate (which is 0.3mm think and relatively fragile) or if you want to experiment with different colors/materials.

The unit shown in the photos was printed with Prusament Galaxy Black PLA, except for the plate, which was printed with Prusament Vanilla White PLA.

It looks quite nice I think with the black equipment

The Vanilla White gives the flash a slightly warmer tint, but you could also print it in plain white of course.

Photo examples

The Galaxy Black (and PLA in general) is surprisingly reflective, and you will lose less light than you would probably expect, but if you want you can print it in a different color, or spray-paint the inside with a white primer.

The example photos with close-ups of a steel mono-pod fastener show the difference between using the printed diffuser vs. using just the little built-in diffuser flap of the speed-lite. Quite effective I think, but your mileage may vary of course, depending on the material you use. (Both photos were shot at maximum magnification, at 1/250s, ISO 200 and F10, with the flash at 1/32 power)

Printing notes

The main unit was rotated to minimize the amount of supports needed. I couldn't rotate it exactly 45 degrees because then it would not fit my Prusa MK4S vertically, but the further back (with the large opening pointing to the top) the better (see the .bgcode file)

The adapter ring was simply printed flat and needs supports regardless which side you print upwards, but in both cases any support scars will be invisible once everything is put together.

The plate was printed with the back side down. This is necessary because it is only one print layer thick (0.3mm) and would probably be damaged by any supports. Make sure your bed leveling is good, otherwise this single layer will give you trouble. (you might consider not printing the plate at all, but use a circle cut from a thin plastic sheet instead, like white polystyrene for example). I glued it to the adapter ring with UHU Plast special modelbau-kleber but anything with a little bit of flexibility will probably do (so not plain superglue, which is brittle and may crack when pressing the adapter ring into the main unit).

Acknowledgement

Even though in the end I did not use anything from Kalle's make, it was a very good inspiration and I think they deserve kudos. https://www.printables.com/model/657718-godox-v860iii-macro-diffuser