function get_link_segment_size() = [15, 30, 5];
function get_link_pin_diameter() = 2;
function get_link_socket_slack() = [1, 4, 1];
function get_link_joiner_arm_size() = [get_link_segment_size().x - 2, 3, get_link_segment_size().z];
function get_link_socket_size() = [get_link_segment_size().z,
        get_link_segment_size().y - get_link_joiner_arm_size().y*2,
        get_link_segment_size().z];

function get_link_clip_size() = [get_link_pin_diameter()*5, get_link_segment_size().y - 5, get_link_segment_size().z];
function get_link_socket_roundgap() = 2;