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The design is based on my cr-10 needs (that I supposed standard...). Some users reported the different belt lenght of both X and Y, so means that on same machines there are some build differences. If the issue is about 1 or 2 mm you can try use the screw of the X axis tensioner, and replace the bearings with a gt2 pulley (smaller diameter, so you should be able to gain the necesssary lenght). Otherwise, you can modify the models and create your own remix dedicated to your machine.