Makerbot Replicator 2

Upgrades

https://3dprinting-blog.com/category/makerbot-replicator-2-upgrades/page/6/

Extruder, hot end upgrades

Replace plastic extruder parts with CNC metal parts https://www.fabberworld.com/makerbot-2-2x-extruder-upgrade

E3D v6 hot end

EZstruder

Build plates

Glass build plate

Heaters https://www.youtube.com/watch?v=eure74A9HNc

Heated build plate - allows use of ABS filament and promotes build plate adhesion with all filament types https://www.ide-3d.de/epages/83488941.sf/en_US/?ObjectPath=/Shops/83488941/Products/MKB2hbp

You probably want a bigger power supply if you add a heated build plate. Stock is 6.5A

• 16A https://www.3dmakerworld.com/store/parts-accessories/electronics/switching-power-supply-24v-400w
• 13A https://www.mpja.com/24-Volt-Power-Supply-13A-with-PFC-Hengfu/productinfo/31344+PS/
• 10A https://www.allelectronics.com/category/480075/power-supplies/24-volts-dc/1.html

I looked up 24VDC supplies on Digikey and did not see anything promising. Newegg has some but they say "ship from China".

Z-axis upgrade - replace plastic parts with metal and replace aluminum guides with steel https://www.ide-3d.de/epages/83488941.sf/en_US/?ObjectPath=/Shops/83488941/Products/MKBz