The slicing parameters are much too different to make a meaningful comparison.
Here is how I would go about troubleshooting this “bumpy” problem. The size of the object should be small enough that the print finishes in less than 20 minutes. Here are two 15x15x5 objects. Cylinder.stl (3.8 KB) Box.stl (684 Bytes)
Using a common set of slicer settings (i.e. same layer height, same infill percentage, same temperatures, etc.), slice the model with both CuraLE 3 and CuraLE 4.
Print both files while you watch.
Hopefully, you will have bumps on the CuraLE 4 print and no bumps on the CuraLE 3 print.
The goal is to find the simplest object that shows the problem. With this object we can compare settings in the slicers and perhaps find one that is causing the issue. If it turns out to be a bug in the slicer, something simple will make it easier for the developers to find it.
I noticed the size difference. I sliced the file in 3.6 and 4.13 and got different sizes by a wide margin again. I’m printing both and watching to see what happens. I also copied my settings from AppData out and reinstalled the 4.13 version and only did basic configuration (printer etc) and added some temperature offsets + lowered infill % and resliced. The file size is almost identical to 4.13 from before I cleared my settings. We’ll see how this prints. I’m very confused as I did not mess with the print motion speed or anything in 4.13 (although I do have a preset with 50% increased print speed in 3.6.37 and it doesn’t create bumpy prints).
Edit: I printed both of these with 4.13 and 3.6 gcode. Neither of the 4.13 print jobs came out bumpy. I’m going to re-try a rocktopus in a second.
4.13 Rocktopus is bumpy again, but less than previously. I’m trying a 3.6.37 Rocktopus.
Edit: Both Rocktopai have bumps on them, less it seems than before, but still all over the place.
Edit2: I’m going to replace the ¿thermistor? on the hot end. I ordered one and haven’t swapped it. The one that was on there looked brand new when I bought the printer, but I have no way to tell.
Problem solved. You could probably guess for a while before you figured it out. The problem was the Raspberry Pi had been booted for too long I think and was lagging. Printed from SD card, no bumps, best looking print I’ve ever made on this printer. The bushing change was massive.