Knowing the MP Vogel is a rebranded Flashforge, I was hoping someone has an idea to help. Everything works fine for about an hour then it stops making clean lines and filament stops extruding properly. It creates these weird clumps along the top layer and seems to be extruding small clumps at times. Some thumping with intake motors at times too and I have seen the filament slipping. Today, I noticed the thumping after it was producing the globs on the top layer. I have taken apart the print head assembly to clean it but everything looks good. Same for the feeder assembly. The print is something my students are working on. It worked great for about 7 prints, then has failed the last dozen. I have successfully printed small sample cubes, so it clearly is something about these longer jobs. I have also had this happen with two different filaments, concerned that it might be just a bad roll.

Some pictures of the print and filament feeder. https://imgur.com/a/lylleNu