I have also wondered about that.
I thought that the bronze bushing has less play then the ball bearings (on my UM1)
That might be it... I dont know... Hoping that someone with intense knowledge of the design decisions that went into the UM1, will pick up on this thread.
Seems counter intuitive though that the extrusion head itself has ball bearings, while the XY slide blocks that its attached to has the bronze bushings? In the end they move in exactly the same way right?
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xeno 108
I have also wondered about that.
I thought that the bronze bushing has less play then the ball bearings (on my UM1)
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