Software apps and online services
Hand tools and fabrication machines
As shown in the video, scan the bottom of an Allen pack (or other similar tool) and import into Fusion 360 as a canvass. Trace, scale, and extrude, and you have the design for a custom 3D-printed toolholder.
STLs for these particular toolholders are found here, but the concepts will probably be more useful. Also, don't make a mirror image as I did in the second part!