Canon 18-135 STM lens hood reversible

Having a Canon EF-S 18-135 STM lens that come without a hood, I try to print both [Canon 18-135 STM lens hood](http://www.thingiverse.com/thing:38336) and [Canon EF-S 18-135 Lens Hoods](http://www.thingiverse.com/thing:448437). Both can't be reverted for storage. Furthermore the second one is too heavy but the full version despite being large doesn't obstruct the view at 18mm.

So I copy the fixation to the lens of [Canon 18-135 STM lens hood](http://www.thingiverse.com/thing:38336) and made a