Summary

As a result of 'slider-gate", I decided to design, model, and print some new knobs for my EP-133 with a space invaders flair.

Since the slider fit is contentious, I included two sizes so you can decide your preferred level of snugness vs risk of breaking your slider.

You can paint the tops to make them stand out a bit more, or edit the gcode and switch filament colors.

I recommend printing in fine quality for the detail, and use an SLA printer if you have one for even cleaner results.

NOTE Your printer setup may vary from mine, so please be gentle when you test and make sure you don't need much force. They should be snug, but easy to fit.
You may need to do a bit of fettling to get a nicer fit.

I sliced in Cura and printed on a Monoprice MP10 with a modified hot-end (direct drive Ender 3) and used Voxel PLA+ at 210c. The knobs in the photos are printed at Normal quality (0.16mm layer height), but I may reprint them in fine quality or switch over to SLA.