Help! Getting closer finally but......

[Turbojoe]

Happy my failures and search for remedies are helping others as well. We should all be sharing our problems and what we found to correct them. https://all3dp.com/ has tons of good info that I've been trying to understand and implement. It may not be possible with my almost 66 year old pumpkin head.

 

[FlamingRCAirplanes]

OK, so I was getting great prints after upgrading to Cura 5.0 beta but didn't truly understand why. I was using CURA 5.0 with a 4.13.1 config with some very minor adjustments. I decided to start with a clean 5.0 file and adjust from there as I'll be using 5.0 from now on. For the sake of fast printing I'm using a self created 30x30x2mm w/20mm hole. With a clean Cura 5.0 file my print is X=29.88 Y=29.88 Z=2.08 The hole is 19.83 concentric. I had noticed some very slight stringing before starting off "clean" again. Now the stringing is gone. I do have "bumps" at each corner that are .38mm larger than the area between those "bumps". I can cut or sand them off but I'd prefer to learn what to change to eliminate them. I want to eliminate those bumps first and then go on to making adjustments to the printer and Cura to get all my printed dimensions back to where I want them again. Based on my "bumps" what would you change? After I get that done then I'll again make the steps/mm and expansion adjustments as needed. Learning by doing always works best for me.

Joe

I have found the setting my jerk speed and cornering speed to my print speed fixes bumps on the edge

 

[Turbojoe]

I have found the setting my jerk speed and cornering speed to my print speed fixes bumps on the edge

Thanks. That was a big help. I decreased jerk from initial setting of 8mm/s to 3mm/s in 1mm/s increments and found 4mm/s to be the sweet spot. I went from a .30mm middle width with 30.27mm total width at the corners. Now I get 30.16mm corner measurements. Any slower settings have no effect other than making the perfect 30mm middle measurement smaller. Print speed is 50mm/s. I also lowered X and Y acceleration in firmware from 1000mm/s to 500mm/s to match all the other 500mm/s settings.

This leads me to believe I've maximized jerk/acceleration but still have another small tweak needed to get spot on. Those little bumps aren't a big deal but I view it as an important learning process to gain a better understanding of all those settings in Cura. It's a good thing I'm retired and have a lot of filament on hand. LOL. In watching this CHEP YT video it appears this is mostly a Cura 5.0 beta issue. Until there are further updates to the beta I can just clean off those bumps for now and move on to other tweaks.

 

[FlamingRCAirplanes]

Thanks. That was a big help. I decreased jerk from initial setting of 8mm/s to 3mm/s in 1mm/s increments and found 4mm/s to be the sweet spot. I went from a .30mm middle width with 30.27mm total width at the corners. Now I get 30.16mm corner measurements. Any slower settings have no effect other than making the perfect 30mm middle measurement smaller. Print speed is 50mm/s. I also lowered X and Y acceleration in firmware from 1000mm/s to 500mm/s to match all the other 500mm/s settings.

This leads me to believe I've maximized jerk/acceleration but still have another small tweak needed to get spot on. Those little bumps aren't a big deal but I view it as an important learning process to gain a better understanding of all those settings in Cura. It's a good thing I'm retired and have a lot of filament on hand. LOL. In watching this CHEP YT video it appears this is mostly a Cura 5.0 beta issue. Until there are further updates to the beta I can just clean off those bumps for now and move on to other tweaks.

Glad I could help! I found that setting my cornering speed to 30mm/s and printing at 30mm/s almost completely removed the edge. It has something to do with that cura forgets to slow down the filament extrude when it goes around the corners at a slower speed then it is printing in a straight line, thus causing there to be more filament on the edges then the middle