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Hi there - quick update / we launched a couple of F, G and H motors last weekend with good results from the rail guide (not-so-good results from the CTI Pro24 motors but that's another story).

One breakage occurred from the V2 rail guide on the second launch where the two screws grip the carbon fibre tube - looking at the design again its a bit of an obvious weak point that will need tinkering to redistribute the load imparted from friction of the buttons in the rail.

I also had a fin strike where I had placed the rail guide very close to the bottom of the rocket body - no harm other than chipped paint but might put it a little higher next time.

Overall its progress - printing with higher wall thickness (1.6mm in my case) seems to be a lot tougher - let me know how you go?