This is a holder for AXA 100 Quick Change lathe tool holders; yes the "Holder Holder" in the thing name is intentional :)
Designed to be screwed to a board or wall by your lathe, it holds two AXA 100 tool holders. I suggest using it with the screw holes in the vertical plane.
The body is slightly tapered as I found that without this the metal AXA holders could stick on the plastic body which is a PITA if you're reaching over the top of your lathe to put a holder back.
Print with a decent wall thickness (2mm ish), low infill (saves plastic) and coarse support (it's only needed to prop up the platform underneath the lettering).
Fusion 360 design so you can tweak to suit is here: https://a360.co/2MeBcEn