Ender 3 Upgrades : Best Essential Upgrades for Your Budget 3d Printer 

These are the ender 3 upgrades I have found to be the most essential for getting the most out of your budget 3d printer
links to items on amazon:
-dual z axis: www.amazon.com...
-dual gear extruder: www.amazon.com...
-bolt in thermistor: www.amazon.com...
-magnetic build plate: www.amazon.com...
-bi metal heat break: www.amazon.com...