Hi mountbaldy

I had the same problem. i buy my printer online as a secondhand.

My fixed was:
- the first smartextruder is verry bad. change to the Tough PLA Smart Extruder. He has a stronger spring inside. Now a have no problem with second filamentpart. the print quality by my printer better is it now.

- XY transfer. my printer was not perfect assembled. i fixed that and the quality was better no i print +- 0.05mm quality. when you have a old belt change that.

- i print only with simplfy 3d software. my best invest. the printer is faster and has a better print quality. the software company has a good support and one of the best tutorial.

- my printers has all the build tak. https://www.buildtak.eu/

regards
stefan