3d printable handhold...
Feature: Anchors that can be glued on to the wall with Anchoring epoxy used for rebars
: Indoor climbing, gym training
Material: Sandstone for size, High Impact & Heat resistance
1. Polyurethane disadvantage: "If the polyurethane is too soft it will split apart when the hold is tightened, or the bolt might get pulled through the hold. If the polyurethane is too hard it will be brittle like resin. Polyurethane holds do not hold up as well when exposed to the sun and rain, so they are not as good for permanent outdoor walls as plastic or resin holds will be" (wikipedia)
2. Resin disadvantage: "The edges of resin holds are prone to chipping, and between holds getting dropped, put into buckets with other holds, tossed around, and washed, resin holds quickly take on a beat-up appearance. Furthermore, the chipped or broken edge of a resin hold can often provide an unintended place to grab that can be sharp or otherwise dangerous to the climber. Because resin holds are not flexible, they will often crack suddenly if they are being tightened down on a wall that is not completely flat. A final problem is the weight of resin holds. As hold sizes have grown and grown, in many cases resin has become an impractical material to use. Even when the hold is hollow-backed, resin is still quite a heavy material to be carried up the wall in a bucket."