2d3d/Kindergarten-Schiene-Verbinder.3d.scad

$fn=90;

D=12.5;
H=10;
x=5.5;

translate([+(D/2+x),0,0]) cylinder(h=H, d=D, center=true);
translate([-(D/2+x),0,0]) cylinder(h=H, d=D, center=true);
cube([3*x,7.0,H], center=true);