This is a Remix of the original Hairy lion with a brim added to the cylinder only. The cylinder often needs a brim but the rest of the model doesn't. In your slicer, disable the "Brim" option and it should print just fine.
Also attached is the brim alone so you can use separately in your own projects.
After printing, cut away the cylinder from the "hair" with a sharp knife. Take a hair dryer on low heat (most heat guns produce too much heat too fast) and gently tame the mane.
I imported the original model into Meshmixer to get the dimensions of the cylinder around the lion. In Fusion360 I created 75% of a circle and extruded it to give a few layers of depth, then exported that STL. In MeshMixer I aligned the two pieces and joined them together.