Making your own DIY leather stamps on a 3D printer isn't as technically complicated (or expensive) as it may seem. In this video I make a leather dice tray/valet with a customized logo stamp. Beginning with a very brief overview of the process I go through to design and 3D print my own custom leather stamps.
Inkscape and Tinkercad are both freeware. A resin 3D printer will set you back a couple hundred dollars, but will more than pay for itself with all the things you can do with it.