musk wrote:Acceleration can cause issues like this on corners and anytime the nozzle makes sharp turns, in part due to pressure in the nozzle.
1. An extremely "soft" acceleration value starts to slow the nozzle down so far ahead of the curve that the built-up pressure in the nozzle has a large amount of time to release over a lengthy stripe of extrusion.
2. A "medium" acceleration value won't slow the nozzle movement until it's fairly close to the corner. This means that all the extruder pressure gets dumped in that small area just before the corner.
3. An extremely "hard" acceleration value results in pressure that doesn't change at all before the nozzle encounters the corner, creating the potential for perfectly volumed extrusion. In practice though, the violent printing experience that comes with hard accelerations will increase the prevalence of other artifacts like ringing, skipped steps, and mechanical instability of your printer from the sustained earthquake.
I've seen this type of thing too. I suppose that the results depend in part on what kind of filament you are using.
Musk, do you have example values to propose?
I tend to think that the "extremely soft" value would be so low that your effective print speed would be very slow. I was using a value of 750, which I guess you'd call "medium" and the corners, edges where the nozzle was supposed to stop printing for a "travel move," and layer changes all got a lot cleaner when I upped the acceleration to 4000. The shaking isn't too bad except where there is small, detailed infill.
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