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This is the rotor riot Skidz Kwads. the length has been adjusted to fit on thinner arms, and works prefectly with Alien, Reverb, Dquad, Astrox, etc... basically all quads with 16-19mm motors mounts.
For the infill setting, the more it will be, the stronger it will be, but also the heavier. Personnally I print 60% infill.
prefer ABS if you can choose, but PLA works as well.
v2 : basement is now bigger than v1, to avoid breaking.
v3 : Basement height increased to 1.2 / shape cleaned