Latest Test Results:
The Coast .6 is showing the least zipper, but I have some concerns on the head jerking.
I think what is happening is that at the end of the layer, after the coast, you're moving the head back .2 to .6mm from whence it came. There is an audible 'snap' on my printer when this jerk occurs. It's kinda disconcerting. But more than that, I think it's not helping the finish.
What if you instead continued to move the head .2 - .6mm forward (just following the beginning of the path) instead of going backward. I think this might result in even more seam inprovement as there wouldn't be an abrupt stop and retrace.
Of course, this opens the issue of what if then end of the layer is not where it started and there is nowhere to go forward - which it probably why you do a retrace backward...
Hmm.....
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lars86 42
Okay, I went ahead and cleaned up the original post for clarity. I also took out the code which had no coasting. Since it appears to have no appreciable difference on the seam, it was a redundant print.
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