I recently purchased an Ender 3, and want to share the tips and tricks:
Upgrades:
https://www.thingiverse.com/thing:2894097
https://www.thingiverse.com/thing:4096147/files
https://www.thingiverse.com/thing:3765594/files
https://www.thingiverse.com/thing:2917932
https://www.amazon.com/gp/product/B079JZ374W?tag=all3dp0c-20
https://www.thingiverse.com/thing:2920060
https://www.thingiverse.com/thing:2943218
https://howchoo.com/g/ntg5yzg1odk/using-octoprint-with-the-creality-ender-3-3d-printer