clear/tough in an 80/20 ratio might be a good option. I’m interested in how your experiments come out. please post your findings. might want to do a plain resin and a lubricated resin and then test to failure first (like with a drill spinning a shaft in the bushing) and timing it or something. roundness and tolerances will play a big part in all of this. make sure you’ve dialed in xyz in fine tuning first.