airsoft tracer unit suppressor

I just closed the hole at the beginning of the tracer unit to a 9mm hole. It allows for the tracer to fit onto the inner barrel. Since I am 3d printing the whole gun, I didn't really need a real outer barrel, this allows the inner barrel to slide in to about where I need it. Im not sure if this tracer unit works just yet, but I do have it wired, buttoned up and lighting up. I dont have all of my gun internals to test it yet. I would print the outer body at 1 or 2 percent larger so that the inner part goes in easy. I printed mine at 101% and the inner part took some real pressure to get in and its not coming back out, no glue needed. But I was not able to push it in all the way and theres like a 3mm gap at the outlet. Thats why I say maybe 2 percent larger on the outer. I used 1 percent and it was super duper snug. I printed with no supports. My inner at .35 layer height and outer at .2mm layer height just to be a little more pretty, but .35 would be ok too.
*if they are the regular r