IKEA Kallax Adjustable Levelling Feet Collection

I bought a couple IKEA Kallax organizers for my old apartment, but none of them ended up sitting level. This motivated me to put together a couple designs of adjustable leveling feet, allowing me to stabilize and level all my new furniture. I've provided three collections of models:

1. “Levelling feet for Kallax - Factory End Screw” - these are meant to be mounted to the bottom of a Kallax using the original end screw used to fasten the bottom panel to the side panel. Install by unscrewing the screw completely, inserting the screw through the levelling foot body, and rethreading the screw into the original location on the Kallax. 
2. “Levelling feet for Kallax - User-drilled Screw” - these are meant to be mounted to the bottom of a Kallax with screws drilled by the user. Depending on the orientation of the organizer, the end screw may come out of the side panel, rather than the bottom. In this case, you must screw these leveling feet in place yourself. Two #8 or M4/M4.5 wood screws per corner (8 total) can be used to attach the feet to the organizer.
3. "Levelling Spacers for Kallax Stand" - For use with this item or similar; I needed a bit more adjustment range than the factory leveling screws could provide. I've included some blocks that add 12mm and 24mm of height to the stand

Some notes on the printed threads:

• This seems to print fine, if not better without supports--ensure your printer has acceptable overhang performance!
• Printing with 0.2mm layer height produced functional threads
• I designed this for printers that require ~0.35mm clearance for through-running parts. you may need to adjust the model if your threads come out sloppy or too tight
• A bit of silicone grease seemed to make adjustment of the threads a lot smoother!