Etymotic ER4B/P/S Universal Fit

I got the ear mold file from GrabCad: https://grabcad.com/library/mold-for-an-ear-trinota-1
And modified by adding a hole for ER4s.
After some trial and error, this is the best fit for me.
I don't think they change the sound signature much. But they definitely help preventing the ear plugs go too deep into my ears especially when i try to sleep with music.
Please try and feedback how they fit. Just easily put ER4 in the hole then put the tips on.
Please print with higher definition to get better surface quality for your ears.