+ // plus sign - vertical line
+ translate([batt_len/2 - 1.5*wall-plus_width/2, -plus_width/2, -batt_diam/2-wall])
+ cube([wall, plus_width, infty]);
+ // plus and minus signs - horizontal line
+ for(x=[-1,1]) scale([x, 1, 1])
+ translate([batt_len/2 - wall - plus_width, -wall/2, -batt_diam/2-wall])
+ cube([plus_width, wall, infty]);