This version now securely slides into the rails instead of resting on top. There are gaps for the screws to go into, you just remove the screws, slide it in, then replace the screws. I also changed the positioning of the tools to allow easier access and included a slot for the SD to USB converter. Finally, I increased the size of the hole for the largest hex key as mine wouldn't fit. This is a quick print (about 3 hours) that doesn't use much filament and is able to hold all the tools that came with my ender 3 pro. I printed upside down, with supports everywhere at 40% infill and 0.2mm resolution.