I really want to put sand in the three sq tubes in the gantry but I'm getting worried about the weight of my y and z. I'm not actually at the point in the build where I'm going to put the sand in but I need to decide now if I'm going to as it affects other choices. I know its a bit late in the process but I'm a bit shocked after actually totaling the weight of my y and z components. Comes out to +- 128kg. The sand will add another odd 20kg's. I'm willing to sacrifice performance for cut quality but maybe I've taken it too far. Not sure if I completed everything correctly but for my X calcs the motor calc spreadsheet turns red (margin of 2.5x instead of 3x) when I fill in my specs but I don't think its accounting for the fact that I have two motors? Will I be ok with this or should I rather reduce weight and not put sand in?