Ender 2 Tool Tray
One of the early upgrades I found for the Ender 2 was this little tool tray that sits in a gap between the controller and the y axis. I downloaded it and plugged it into Cura and after slicing it told me it was going to take 8 hours to 3D print. As with most of these things I redrew it in 2D, lasercut the parts from sheet materials and assembled it. The whole thing took 30 mins from start to finish, the laser cutting part was less than 1 minute. 8 hours vs 1 minute is a massive difference. (svg here)