Simple holder for the tools supplied with the Ender 3. Slides on to the aluminium profile.
There are two variants - the larger version holds all of the supplied tools including the spatula. However if you have the removable bed and never use the spatula, there's a smaller version without support for the spatula.
Lastly you'll notice a small fragment of the part that slides into the aluminium extrusion profile - this is to help tweak the model to get a snug fit with your printer. The setup here works for my Ender 3 so just try it first. If it's too tight or too loose when you print it, adjust the "profile_clearance" parameter in the Customizer until this small piece is a nice fit, then use the same value to generate the holder.
You can use the customizer on Thingiverse, or directly within OpenSCAD version 2018.06.01 (a development snapshot available on the OpenSCAD downloads page).
Hobbyist designer in the UK.