include <BOSL2/std.scad>

down(7.3) left(20) back(0.35) import("/home/sasza/Pobrane/1.stl", center=true);

t = 1.5;
frame_dist = 0.4;

thumb_size = [12,14,t];
thumb_fwd = 20;
thumb_up = 2;

chain_hull() {
    cyl(d=8.5, h=2.22, anchor=TOP, $fn=36);
    down(t - frame_dist) right(thumb_fwd) fwd(thumb_up) zrot(180+45)
        cuboid([t,thumb_size[1],t], anchor=LEFT+BOTTOM, rounding=t/2);
}

right(thumb_fwd) fwd(thumb_up) zrot(180+45) down(t - frame_dist) yrot(-90) down(t) 
    cuboid(thumb_size, anchor=LEFT+BOTTOM, rounding=t/2);