Hi,

This tool holder uses the gridfinity system developed by Zack Freedman of Voidstar Labs.

Seeing idea to have tool box sitting on PSU: https://www.printables.com/model/517335-toolbox-for-prusa-mk4-tool-holder. I made my own design with accomodation for gridfinity, Nextruder nozzle holders and additional holders for whatever you can wish for. It catches on frame and sits on PSU so no need for screws or other tools! I limited grid to 2x2 as it seems like enough of space for most wanted tools and does not go out of printers contour noticably.

Rather than trying to figure out what would be best combination of holders, i thought that gridfinity would allow for everybody to have what they need. Seems like ideal match to have it on tool holder.  There are also some hooks and holes added on the side, but If gridfinity is not enough of customisation or you dont like my options, I also added model without them to allow for easy remake. 

Print is very easy and comes out great on mk4. I fits very nicely on machine, with elevated latch giving it plenty of suport to not wobble with heavy tools on hooks.

Gridfinity page:

https://gridfinity.xyz/

Share if you see some improvements or other suggestions! Will try to update whenever possible!

edit v1.4:

enlarged some of hooks and tweeked allen key holes 

edit v1.3:

-Improved hooks

-added version with no additional fixtures.