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BackA drone / manual version, https://kassu2000.blogspot.com/2018/07/avalance-vco.html for a clock on the rails v_wall(h=4, l=height-rail_clearance*2-thickness, th=thickness*1.25); v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top horizontal rib // one more vertical.
- -2.644445e-15 -1.000000e+00 facet normal -0.472795 0.88053.
- Normal -2.146863e-001 3.694617e-001 9.041061e-001 facet.