It is fully printable without supports positioned as it is on the buildplate, however I found the strength and plasticity of the holders in the middle weak and fragile. So I recommend printing it vertically like the one in the pictures. It does use a lot of supports, recommend tree supports.
Mine was printed on basic E3V2 with AzureFilm PETG 225/80 C
The author marked this model as their own original creation.