This document discusses improvements made to a 3D printer. The original 3D printer design had four sides and no cooling system, which caused overheating issues. The updated design introduced side cooling on one side to address overheating. The newest design features round or square cooling on all sides for even better heat dissipation and prevention of overheating.

1. Significant Improvement for 3D printer

4. Original
Four sides

5. Cooling issue: overheating
No cooling
One side cooling
(Now)
Round or
square cooling