[Support] Is there somewhere that I can get replacement parts for my broken controller? (Or can I repair this myself easily enough?)

So I got off with Steam support to find out that they don't do replacement parts and they can only send me a complete controller. Since my warranty is up I'd rather see if I have cheaper alternatives first.

This is the damage, the small little bit of plastic that goes over the receiver on the circuitboard for the RB button. In the middle of playing a game the button suddenly stopped clicking and responding, taking apart the controller the snapped off piece you can see out of focus on my desk fell out. This piece of plastic was connected to the larger piece that holds the right trigger to the circuit board and it served as a sort of buffer between the board and the RB button.

Snapped off in the middle of Dark Souls and I didn't even use the controller all that much overall, about 240 hours total. I'm also not even a rough gamer, wouldn't even think of throwing a controller.

So is there somewhere I can go to get this piece of plastic to repair my controller? Or is the repair something I can do myself easily enough without damaging the controller further?

EDIT: I've found these files for 3D printing, I recommend having a look if you're in a similar position.

EDIT 2: Welp, the problem is kind of fixed. After trying 3 companies and the first two saying I needed to print in polycarbonate according to the notes (thought I found the option on the second company but I was wrong) and they didn't print that stuff, the 3rd one did anyway. Pity they told me that they don't print in pc after they decided to print it in another material and ship it anyway.

Got it today and right off the bat I had some problems. The hinge holes for the pin on which the trigger is connected, those were too small and I unfortunately ended up breaking them. Not that it was likely to work anyway since the pit that the spring was supposed to rest in wasn't the same as on the official part and didn't look like it wanted to stay in. Chances are it may have slipped out during play.

In the end I decided to just try wedging some lose paper in there to act as the buffer. That didn't work so I just took the snapped off piece of plastic I kept and held it in place with blutack.

That's how I fixed the damn thing, I put the part back where it snapped off from and held in place with office supplies.