Hello! Parametric sliding lid boxes for everyone! 

This means you can generate a box in whatever dimension you like, with several parameters that can be altered to your needs.

Some information for you:

on printing:

• The boxes work very well both in PET-G and PLA. The sliding lid is a little snappier in PET-G, so I'd recommend PET-G.
• Print settings are up to you, infill percentage can be fairly low. Probably best use a 0.4mm nozzle but if you set the vertical wall-thickness to 4mm a 0.6 nozzle works great too.
• From all of the test prints I have done only one of my filaments does not seem to have the dimensional accuracy to fit the tolerances of the sliding mechanism. :) I print on a MKS3.5 and a mini both equipped with E3D Revo hotends.

on generating any size box you like via FreeCAD:

Included for download is the FreeCAD .FCStd file in which you can modify the boxes to your desire and export them as .stl files.

• The spreadsheet includes inside/outside dimensions of the boxes, depending on which is more important to you.
• You can find a PDF attached with some information on the dimensions of the box and how they are linked in the spreadsheet.

I have included some instructions in the spreadsheet to help you navigate any tinkering you might want to do. 

a screenshot of the spreadsheet below:

• The parametric design is based on the outer dimensions of width and length, inside dimension of height, both are however shown, up to you to add wall-thickness to inside dimensions for W and L if you need something to fit precisely in to a box!

Instructions for those of you completely new to FreeCAD:

1.  download freecad here: https://www.freecad.org/downloads.php
2.  download SLIDE_BOX_FREECAD below.
3.  open the .FCStd file in the .zip you downloaded with freecad.
4.  in the model box on the left, double click ‘Spreadsheet’ to open the spreadsheet.
5. in the spreadsheet you will find instructions on how to alter the dimensions of the box
6. if you wish to see both the spreadsheet and the 3D viewport at the same time 
   select windows → tile from the top-down menu.
7. alter dimensions to your desire - detailed notes on what you can change are included in the spreadsheet.
8. to export the box body and lid as .stl for printing select Body_BOTTOM in the model box and then click file → export and choose STL Mesh (*.stl *.ast) as your format.
9. repeat the same for Body_TOP
10. That's it, you've got your files for slicing and printing!

design/miscellaneous notes:

• The boxes have a little tab on the lid so you can easily open them with your thumb while holding the box, which I find very satisfying! Snap!

• The .STLs that are included in the model page are examples, if there are popular sizes people might suggest I add I can do so.

Happy printing and organizing and feel free to have a look at my other models!

I'd be happy to see your makes, get some feedback and I am of course open to ideas and improvements, I might then update an updated model with alterations if there is enough interest. Don't forget to save and like the model! (but only if you actually like it, of course!) <3