Below are the top 3D-printable Ender 3 mods and upgrades you can perform. Tons of other printable mods exist, but this is the core list that will give you the best bang for your print time.

Board fan guard

Before you print anything else, print this mod. The location of the mainboard fan is directly beneath the build plate, meaning bits of filament can fall in and damage the fan or board. The model is available on Thingiverse.

Filament guide

This filament guide holds the filament away from the feeder, allowing for a more consistent feed rate and less skipping. It snaps directly into the side of the upper support.

Cable chain

This cable chain is a must-have for preventing dangerous cable snags when the bed moves along the Y-axis.

Display PCB cover

This simple screen cover protects your Ender 3 display's PCB (printed circuit board) from damage.

Bowden tube fitting fix

If your Bowden tube has popped out of place or if you're having print quality issues, you might want to print these pressure fitting shims that will prevent your Bowden tubes from shifting or popping out during printing.

Beeper silencer

You've probably noticed how loud the Ender 3 beeps when navigating the menu interface. This beep can level villages and knock satellites out of orbit. This 10-minute print mutes the beep quite a bit, getting rid of that annoyance and protecting our countrysides and space assets.