Filterholder/Mini matte box

I found a bunch of colour filters (I think for my flashgun). This is a prototype thats supposed to fit on my 50mm lens (51mm outer diameter), the filters are ~73,5mm x 44,2mm and im pretty sure its a stupid thing to do.

I sadly coulnt test them yet since my printer broke down at the start of the print. 

I will update the design soon™ once I got a working printer again, I can reccomend printing it in a matte Filament so you have less internal reflextions, painting the inside matte should also work