I absolutely LOVE Jimbotron's design for a magnetic Clean/Dirty sign! Unfortunately, the source files were not in the download and the magnets I wanted to use would not fit. So, I re-modeled it in Solidworks using Jimbotron's design for reference.
In addition to different magnet sizes, this Re-Mix includes all of the Multi-Color inserts for the text. I also added some grips on the edges of the sliding cover to make sliding it with one finger easier.
Like Jimbotron's design, it is important to match the polarity on the cover magnets with the base magnets. The top magnets need to 'latch' onto the bottom magnets to keep the cover in place. If you put them in the wrong way, you won't be able to slide the cover all the way to each side.
2x 10x3mm for large base
2x 4x1.5mm OR 5x1.5mm for the top (Two files are included)
Magnets are press fit (no glue required). Use an arbor press or pliers to press in magnets.
If anyone has any other magnet sizes, let me know and I'll try to find time to modify accordingly (if they'll fit).