Blue titan reports:
With layer thickness at 0.2mm and layer width at 0.4mm, all print speed settings are the same 50mm/s and at the UM2 manually set the speed to 50%.
Unfortunately this still gives the same result. (material is Makerfill PLA)
I will also order new teflon parts. I knew it's a consumable, but I have printed less than 10hours with the UM2... How often do you replace it?
This is a common problem. It's caused by underextrusion. I know the extrusion looks pretty good in the middle but it's a small amount of underextrusion - enough to cause this. Also you may have some backlash (look it up on wikipedia) which makes the gaps bigger in some orientations. A different issue, the gap in the leg, is probably related to Cura and not your printer.
Try printing the same part at half speed just to see what happens. You can do this live while it is printing in the TUNE menu of most printers including the UM2. I recommend you have all printing speeds in Cura (there are about 7 of them) at the same value as well. Otherwise you get underextrusion every time the printer speeds up to a new higher speed. For just a few seconds until the pressure in the nozzle reaches a new equilibrium.
It could be you simply need a new teflon part. They are priced cheaply by UM because you need to get a new one often. They are considered an expendable. Like filament. But cheaper. There are a dozen other things that can cause underextrusion. I can post a list if you confirm that lower speeds help. You should be able to comfortably print 3 to 5mm CUBED per second. To calculate your cubic volume per second multiply the line width (typically 0.4mm) by the layer height (typically 0.2mm) by the print speed. If you have to print slower than this to get good prints, let me know. Send me a personal message directly and include a link to this topic.
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