This!sswilson wrote: ↑ I'm one of the folks who's been commenting in the Ender 3 threads on what the best upgrades are, but folks are getting the wrong message from those suggestions. None of the upgrades are an absolute requirement for using the 3D printer, if anything, folks should spend some time using them in their stock configuration so that they've got a better idea on the how/why aspect of suggested upgrades.
I would suggest printing a filament guide or side bracket for the filament spool because one of the first things I noticed is the placement of the spool on top makes the angle very sharp when entering into the extruder. This results in the filament scraping against the extruder arm and leaves a mess of filament shavings around the extruder. This becomes worse with the plastic extruder as it wears it away pretty quickly.