This is a remix of DantRush's tool holder. I redesigned it from scratch and fit it for my Ender 3 Pro. It slides right on the side of the rails and fits all the tools that came with the printer. I added support on both sides of the rail so it would be more sturdy and less likely to break off. It does have a little bit of play and might jiggle slightly if the printer does a lot of tiny fast movements back and forth, but other than that it is steady and secure.

The wire cutter tool attachment was a separate file so that the tool holder can print easily with minimal supports. Just use some super glue or some sort of adhesive to stick it on to the tool holder at the part that should be touching the bed when reoriented.

Update 12/12/21: Added another tool holder STL that uses less filament on the front of the rail. I haven't printed this because the original works fine, but I figured I'd add an options that uses a little less filament. It should still have the same structural integrity.

Update 1/3/22: Removed the old STL's to have only one that was updated to fit the small tool (measures 10.2mm wide now).