I took a closer look and indeed, there is no hard mounting. But I have never mentioned hard mounting - what we need is a (free) rod end displacement limitation system, in order to avoid any resonance phenomena in the long Z-screws. On all decent machines I know, the free rod end can displace in Ø0,5mm or less. On BL H2D the free rod end can displace in Ø5mm or more and I am pretty sure the vibrations coming from the motors match a few times on a full Z length the natural frequencies of the rod = nasty resonance = Z-banding…
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