I needed a right angle screwdriver handle that could fit in a very tight place and none of the things shared online was small enough so I quickly created one using Blender. I shared the .blend file if you want to remix it so it better fits your needs.

For maximal torque resistance, it's best to use thicker walls (at least 5) and honeycomb infill (around 40% or more IMO). Remember that wall thickness is more important that infill regarding material resistance. Increased bottom surface height is also important if you need to apply a lot of force.

Note: The one in the pic is not exactly the same because the version I posted here comes with a slighly rounded tip for better palm ergonomics.