A unique hold for a rock climbing wall. it is designed for 3/8 in bolts. I recommend 10 perimeter layers using a .4mm nozzle. This is one of the few rock climbing models that do not benefit as much from fuzzy skin as the brick texture can be lost.

I print mine out of standard petg for the slightly better toughness and flexibility required when bolting it in. Other material may work just as well.