This is a customizable round tool holder that has half spaced gridfinity base, which interfaces with a full 42x42 mm grid.  Customize the tool diameter, the holder's width and/or length, the floor height underneath the cutout.  I used the file to create extension holders, which I have included as examples or if that's all you need then you should be good to print those.  Let me know if you have issues with the file and I'll do my best to resolve.