Since getting the printer I have mainly been printing recommended part and upgrades. I have found that the majority of recommended upgrades on YouTube videos have actually been resolved on my printer. So the upgrades are mainly for ease of use rather than fixing issues.
This was my second print it has been very useful. As a side note, I did upgrade the plastic extruder parts to an all metal version, this has greatly improved loading of filament.
Front Drawer 4 Ender 3 Pro
This print is great but not really useful. I put all my tools in it but as soon as you print anything it becomes inaccessible. I had to put a tissue in the bottom to stop the tools rattling.
Filament holder 80mm spools
This filament spool has bearing on either side and the filament reels out much smoother and along with the guides below the extruder seems to be smoother.
I chose these due to the bearings in them. The filament passes smoothly through them and well worth printing.
C270 Logitech Webcam holder Ender 3
I had a C270 that i was not using and it seemed ideal for connecting up to OctoPrint. I will add another post about this and my OctoPrint Setup.