OliverK wrote:Try two things:
1. Mounting the (at times rapidly oscillating) build plate and PCB on springs, held in tension by four loose M3 screw and nut assemblies always struck me as introducing excess movement (due to jerk/lurch) into the system. Get rid of the springs and replace them with Nylon (PA) PCB spacers. Obviously they don't have the same adjustment range as a spring, but they compress (and bounce back) enough to allow perfect build surface leveling. For grosser adjustment they can be packed with M3 washers. This makes for a very rigid assembly. I expected the heat bed to warp due to being fully constrained, but nothing happened. Head crashes are taken care of by Barts' excellent Z-wobble fix.
2. Reduce moving mass as much as possible. The standard Y carriage assembly (carriage plate, heated bed, glass, V-groove wheel assemblies, etc.) weighs more than 900g. I made a Y carriage plate with lots of holes that's half the weight of the original. It doesn't just reduce vibration because there is less mass being thrown around (less jerk/jolt during changes of direction), but it's also gentler on the whole drive system. This would also let you drive things faster, or reduce the stepper power.
2. loosening the belts (by a LOT)
OliverK wrote:Ran two quick builds of orcinus' Ripple Test: (tried to take picture with unflattering light to show the imperfections better).
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