yellowshark 153
Hi I had a similar problem last week. I was printing circular geometry, reasonably unusual for me. I fixed it by changing two settings - no stupidly I do not know whether they both contributed or just one of them! I will revisit that but I was in a rush at the time.
I changed z-alignment from random (which I always use) to user specified and changed print acceleration from 3000 (default) to 1500.
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gr5 2,224
It's not the travel *speed*. This travel distance is tiny - maybe 0.4mm, right? It takes more like a cm to get up to 160mm/sec depending on your acceleration. Acceleration for CR10 is incredibly slow because it moves the whole bed. Probably around 500mm/sec/sec (versus ultimaker which is 5000 to 9000 mm/sec/sec). So I'd be surprised if the speed gets up to 20mm/sec. It could be the jerk speed.
Still this is a cool idea. You could easily remove (by hand editing) that one point at the start of the travel and it would just skip that spot and move diagonally and you could see if that fixes it.
I recommend downloading and installing "repetier host". It's free. It has a tab on the right screen that lets you examine the gcode on the right side and see the part on the left side. You can go to the layer you care about and click on the gcodes and it highlights the gcode moves in yellow on the left side. You can click and drag a large selection of gcodes to "find your way".
Then you can see exactly which gcode is for which move and delete the one in question to see if it makes any difference. You'd probably want to create a small custom part to show the problem and that can print in just 5 minutes so you can experiment to see if this makes things any better.
I think you will have better luck just slowing down the print. On the CR10 I think there is a TUNE menu while printing - you could try printing at 1/3 speed to see if a few layers get better and then play with what speed is fastest but still hides the bumps.
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