Screen for YN560iii flash (used as studio background light)

thingiverse

I designed this for my home photo studio based on wireless flashes Yongnuo YN-560iii, specifically for the two flashes used to light up the white background seamless paper in high key portraiture. The flashes are placed between the model and the background, on both sides, and directed towards the background. The included "before and after" studio shot demonstrates that without screens, there is a lot of light spilled from the background flashes on the back and edges of the model. With the screens attached to both flashes, spillage is practically eliminated (you still get a bit of rim brightening coming from the white background; this can be mitigated by increasing the distance between the model and background). The flash attachment consists of two parts (this way, it is much stronger - compared to designs where it is printed as a single part; at least for the designs which do not require any supports). One part (flash_body) attaches to the top of the flash, the second part (flash_screen) slides with significant friction (no glue needed) into the first part. I designed the flash_body part by 2D scanning the front of my YN560iii flash and then following the contour with splines inside Autodesk Fusion 360 program. As each printer is different, and you want just the right fit (not too tight, no too loose) between the flash_body part and your flash, I included the file flash_test, which is much faster to print than the whole flash_body part. Print it first to test if my flash_body part will have a proper fir on your flash. If it doesn't, you can edit the source Fusion 360 file (included) to offset the inner surface of the test part by either a small positive or a small negative value to try to rectify the situation, and then print the test part again. Once satisfied with the result, you should apply the same offset to the flash_body part. Flashes can get pretty hot, so you better use a high temperature resistant plastic, and also the one which is rather flexible (doesn't easily crack when bent). ABS seems to be a good candidate for this. I printed my parts using 100% infill and 0.2mm layers, with black ABS filament (no support is required). I haven't thoroughly tested this yet, but I suspect that one would have to limit the maximum flash brightness to 1/2 of the full power or even less, to minimize the chance that the printed parts would deform or melt. The combined weight of the both parts is 90 grams.