I have recently build my SO3 XL and squared it up as best as i could. I did run a successful hello world, but i have notised that the x-axis make a vibrating sound on the first travel it makes after homing. It only happens when i use rapid position right after homing and when the carriage stops the sound is normal again. It sounds a little bit like the belt misses the pulley. I have removed the x-axis motor and made shure the pulley set screw is secured. I have tried with different belt tension and adjusted the V-wheels. Starting to get stumped on what to do next. Any suggestion anyone?