I bought these because I was having trouble with a cheaper Chinese bottom bracket on my tarantula's Y-axis. This fixed my issues and my prints come out without the weird flattening of round objects that I've experienced. It also comes with a small guide to prevent small balls from falling out. You just line it up with the rail you want to mount it on and it moves easily. This trolley arrives very well greased and working straight out of a sealed airtight package.
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