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sorry for the less introduction.the worm useing 6mm stainless tube for the shaft,you need some epoxy resin to glue it together , and the ball bearing was attach on the shaft ,so ,you need a 10mmX6mmX2 ball bearings . same as the worm,wormwheel need a 5mm tube for the shaft.for easy to printing ,i don't draw the bearing insert position,the bearing attach on the shell in the 10mm hole.so ,10mmX5mmX2 bearings are required. as the picture shown below , the red was bearings . and you need the shaft_keyway_con.stl