Brain Climbing Hold

I am exploring the use of 3d printing to make holds for a climbing wall I am building. While it would be possible to directly print holds this is not optimal for several reasons. In order to be strong enough most holds would need to be printed of a high strength material (ABS at minimum, but optimally nylon or PET) and they would need to be printed at 100% infill. But high strength materials are notoriously difficult to print in big blocks and high infills. Even if the print could be accompli