I wanted to reduce the flow that my cheap 8way emitters were putting out. I bought a cheap 50pack knock off version of rain bird emitters (example in pictures). I have too many in the garden now though and can't get enough pressure so I set out to recreate the caps.

I have a low flow (never actually tested) version of the 360 degree 8 hole cap, a version with 2 holes plugged for a 225 degrees spray, and one with 3 holes plugged for a 180 degree spray. I also made a version with all 8 holes but made to only spray in 180 degrees.

I have a blank cap (no holes) in the files as well has the STEP and FreeCAD project file if anybody wants to make their own versions. 

This will probably require a pretty well calibrated printer. I've only printed them so far on my Voron out of PLA. I tried to design them based off a 0.2 layer height so I'd recommend sticking to that or 0.1

(also uploaded on Thingiverse)