Softer and longer coupling drive cushion to reduce Z wobble for Rat Rig V-Core 3
Description
This mod reduces but does not eliminate Z wobble. On the Rat Rig V-Core 3 the Z linear rails guide the the Bed arms and should hold them on a perfect vertical trajectory. The lead screws will have some wobble to them while turning and this lateral movement of the lead screws exerts lateral forces on the bed arms that argues with the guidance provided by the linear rails and diverts them minutely off what would otherwise be their near perfect trajectory. This argument causes z banding in the prints. *see below for more detail. This argument can be reduced by reducing the lateral forces imparted by the lead screws on the bed arms. One way to reduce these forces is to reduce the stiffness of the coupling drive cushions. Hence this mod. By printing the drive cushions from a more flexible material in one of my ezperiments into my study of Z banding (I used Ninja flexFlex) I was able to reduce the Z banding. Another issue I discovered is the bottoms of the vertical legs of the couplings used by Rat Rig in the current V-Core 3 can touch the bases of their partner in the pair when they flex. This was observed by witness marks on the bottom of one or more of the aluminium legs of the coupling. This is a hard contact and is likely to also be causing some minute displacement of the lead screws that could be contributing to Z artefacts in some instances. Hence I have increased the height of these drive cushions slightly to reduce the possibility of this occcuring. *The Z banding induced by each lead screw will have a 4 mm period to it. The Z banding caused by each lead screw is very unlikely to be in synchronisation with each other. What will typically be observed is three regular Z band with a 4 mm period to them separated by some non predeterminable spacing between the regular period of banding due to each lead screw. The periodic banding caused by each lead screw will have different amplitudes depending on the misalignment and varying straightness of each lead screw.
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