Thanks gr5.
Good shout on the bowden seal. Mine is currently moving, but all i can do is just push it down a little more, the blue shoe doesn't seem to be doing much, each time i push it down it just pops back up again. How did you seat it better?
The Z axis acceleration - is that 'Max speed Z' in the maintenance menu on the machine? It's currently set to 40mm/s, which seems fast enough. How fast does the UM go?
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gr5 2,224
I was at 5.5mm retraction for a while until I seated my bowden more firmly - it used to go up and down with each retraction. Now that it's firmly tight I am happier at 4.5mm retraction. If you retract too much air will get into the nozzle. Which is bad.
Regarding seams and bumps. You can reduce these by printing slower. I find 35mm/sec is slow enough for excellent quality or 20mm/sec for best possible quality. This results in a constant extrusion speed around corners and such which helps greatly to eliminate under and over extrusion on slow down/speed up.
35mm/sec should eliminate your Z seam.
I've never had to use the Z hop. It's really more for delta printers I think where all 3 steppers are moving on every move anyway.
You can also reduce your Z seam by increasing Z axis acceleration. I have only messed with this on the UM Original but was able to get my Z movement from a brief sound to a click it's now so fast. Just by doubling the acceleration (didn't touch Z velocity). I haven't messed with Z acceleration on my UM2 but it sounds much slower than my UM Original so I suspect you can safely double it.
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