Abei's Fallout Vault Boy model wouldn't slice for me in Repetier-Host. It threw an error that the object wasn't a closed manifold. Following suggestions from donttouchmyfork, I repaired the model in Blender and also reduced its poly count by 75%. This model now loads, slices, and prints in Repetier-Host.

I printed this in White PLA on a MonoPrice Select Mini with support and painted it with Acrylic paint.