A 50mm wireframe sphere, please note that the model WF_sphere_50x50_ad.stl reflects the render images and it uses an adaptive thickness algorithm, however it will be quite challenging to print, so I suggest to print WF_sphere_50x50.stl which maintains the same thickness everywhere. The 3D printed model in the photo is scaled and stringing are quite noticeable.
The author marked this model as their own original creation.