Independent axis movement

[taconite]

Hello guys,

just a quick question. I have a delta with a separate axis (u) for the extruder which is moving up as the layers progress. Is there a way to make the moves of the U-axis independent from the X,Y,Z, axis? The movement of the U-axis is done by a slicer script. On every new layer the axis is moving the same amount up.

The reason why I ask is because the effector is pausing for a short moment when the U-Axis is moving (it is a little slower because of the mass) this results in ugly seams.

Any suggestions?

[dc42]

@taconite how would you propose to move the U axis without pausing the effector while that movement takes place? What would you want the effector to do instead?

[taconite]

@dc42 That is a pretty good question. As other movements are parallel aswell, my "wish" would be that the effector is going on with the printing job. *EDIT: While the U-Axis is still moving. BTW we are talking about 500ms or less.

So why not have a G-Command which is executed in parallel to existing movement.
I already had doubts that something like this exists in the firmware and would be hard to implement.

[o_lampe]

@taconite
What you describe sounds like a (spiral) vase-mode motion, but that only works for single wall prints.

[taconite]

btw something like this would be interesting for the Duet Z-hop aswell. As far as I know both are executed after another. When you put both in one command the speed of the smaller movement is slowed down so that extruder and z-hop are reaching the finish line in the same moment.

I already mentioned something like this here:
https://forum.duet3d.com/topic/21018/different-movement-type

[taconite]

@o_lampe the effect was the most visible on vase-mode but for other prints a pause at layer change (so at the seam) is negative for the quality aswell