The flat pipes tend to not need wicks as they're thin enough that they get the added benefit of capillary action. Any tube design, excepting ones using fairly-t

The flat pipes tend to not need wicks as they're thin enough that they get the added benefit of capillary action. Any tube design, excepting ones using fairly-thin tubing (2mm OD 1.5mm ID) will likely use a wick for its own capillary action.