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I have also looked into your video, I noticed that the motor mount still half way out on the inside (supposed where the RODS to go in the original design of the Hypercube and HEVO. Now there are no more RODS, for the motor mount and the pully - can those put push out towards in the middle of the 3030 extrusions instead? (there would be a 12mm offset of course) Also would the 4 screws holes for the Y Carriage Blocks of the MGN12 rail blocks could also be used for the 20T tooth pulleys? which not only save screws - but also helps with the inertia as well, as the X MGN15 would sit directly on the bottom of the rail and sandwich with the pulley blocks than off in the side where "plastic is your weakest point"? Just some ideas....