Models
Sharpie Holder 3D Printable Models. Makeshape.co have 2 Sharpie Holder 3D Printable Models.
Marker Rack with Skadis Hooks
Thingiverse
SavingTheOcean
Free
Sharpie Organizer Solid and 1×4 Gridfinity Base
Thangs
CGorecki Designs
Free