Tuning Spacers for FX Carbon Fiber sleeve on FX Crown MKII

I finally got around to designing some spacers and I thought I would share the file for those with 3D printers.
I decided to make mine out of TPU and eliminate the need for o-rings.
My carbon liner O.D. measures 11.9mm from my understanding that is pretty standard.


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Hi first time on Airgun Nation, I am based in New Zealand so love to see what you guys are doing with FX air guns, I have a FX Crown MKII .22 Continuum with all the Huma Air added parts to shoot slugs, dual port, heavy spring pin prob.
Can I ask what size CF tube are you using for the supper light barrel liner, the only one I can get in NZ is 8mm ID 10mm OD, I measured my barrel with the digital callipers, it comes out at 8.1mm or 0.318898", as you can imagine I am very limited as to what I can get over here.
I mostly shoot longer distances with my rabbit pest control with 25gr slugs at 985 fps, with 700mm barrel, I am getting good grouping less than 1 MOA @ 110yrd and less than 2 MOA @ 160yrd.
your thoughts please