Free 

With this K1 exhaust fitting you can get your printer quite a near to wall and still get D90 exhaust hose out from it. I made this part on two pieces, because for easier printing. Just tape pieces together with ductape after printing,
In addition of .stl files, I added my *.f3d file here, so you can modify it as you want. Part design is started from meshfile, so the base part editing is not the easiest one, but it works.












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