Simple Modular Shelves and Cubbies.

Sizing guide and print settings.

The length and width of the drawers for both the premade models and generated models are the outer base dimensions, while the height is off of the pillar size.

For example, if I want a bin for a shelf using a 6x4 base with 2 in pillars, I will need to grab the 6x4x2 bin file, the 4x2 wall file for the sides, and the 2 in pillars.

The actual dimensions of the inside of the box will be 4.827 x 3.343 x 1.906 in, effectively losing 1.973 in in length, 0.657 in in width or depth, and 0.093 in in height. These losses are the same across all drawers.

As each shelf/base is 0.2 in thick, using one set of standard size and one set of -0.2in pillars will result in common heights across different units due to the extra height from the shelf. More combinations are possible by adding or subtracting 0.2 in. from the tallest and smallest pillars in your set. Note: That sizing works best if things are multiples.

Side walls are needed to ensure smooth drawer operation, but the back wall is optional. Adding a back wall may provide extra stability. Additionally, any connector under the pillar size can work, but matching their heights helps to prevent things from sliding.

Stock the drawers have a 1mm tolerance between the bottom of the shelf and the top of the drawer. This is not fully tested but should be close to the setting I used, so due to this, you might find your drawers drooping more than my prints or that they bind a little. So, I recommend printing a small 2x2x2 model to see if this works for your printer. If needed, you can adjust the model parameters to give more or less space. Doors will need to have a copy mirrored to use.

Finally, if possible, try to print the pillars and small connectors vertically to prevent bridging. Additionally, do not print the walls with brim supports, as it is very annoying to remove. 

Edit

Brace supports added that can be glued in place to help with different-sized connections. You can also combine wall lengths to put in a pillar at a different spot on the wall to have more connection points, but this will block the drawers from moving. You can always make non-captive chores but they will not work well in this current setup.

To modify this design,

I would use the comp 2 file as it is definitely the better put-together file for this project.

To learn more about assembly and how to modify model parameters, I recommend reading the project user guide. If you are a fan of bad one-shot YouTube videos as your primary form of torture, I recommend watching the video (sorry about the microphone quality).