Lm8uu printable bearing

I designed this to use as a printable linear bearing. I designed it so, if the time came that i wanted to upgrade to a bigger bed then i could print the bearings. They were designed so, that i can spray silicon lightweight lube into them though the threads (inner grooves). I really don't like lm8uu bearings because they are made from a mix of rubber "horrible friction without lube" and ball bearings that can and will fall out if put on without an extra gentle touch. They were designed so that th