I’ve had a 3d printed adapter/air stripper on my Beeman underlever for almost 1.5 years with no issues. I tried several on my TalonP made from heavy duty composite materials, they all failed. I broke down and purchased a DonnyFL adapter and it was the right choice. I removed a 3d printed one from my Alpha the other day and went back to the stock moderator. I do a lot of 3d printing, some things should not be printed. You risk catastrophic failure and at the very least baffle strikes. I had several spectacular departures from the end of my TalonP. I use 3d printed moderators all the time. I keep four printers busy.