Simple holder + inserts to bring life into models eyes 

works as Bounce Card replacement 

tested with Godox TT685 II, TT600, Yongnuo 560 II, Neewer NW880 

should work fine with Canon/Nikon or other strobes too if they have similar head, but I haven't tested that

Print your own inserts in whatever color you want, you can also make them bigger, smaller, whatever you like, the part that fits into holder is 60x30x1 mm, the insert I included has bottom 10mm only 0.8mm thin because the hole in holder slowly gets narrower (so it holds insert strongly) but 1mm will also work 

the hole in holder is 60.5x33x1.5 mm at top and 60.5x33x0.5 mm at bottom - 60mm wide and 1mm thick plate ensure snug fit

if you can't add insert while holder is on flash (some flashes have bumps that bend the holder a bit) don't panic, just add the insert into holder first and then put the whole thing on flash, should work perfectly fine 

you can print multicolor inserts if you want, I recommend using white or gold color for them, you can do one side gold, one white... or you can pick red for example, be creative (or paint patterns on them, do whatever you like)  

also, sides have holes for insert - from original model: 

"on the sides, there is room to insert some short M4 Brass inserts from CNC Kitchen, to be used in combination with nylon screws. I did not use them in the end, as the attachment fits snugly on the flash and doesn't need any additional locking mechanism."  - they also fit cheap M3 and M4 inserts

check out my other models, I'm adding some other camera related stuff