READ THIS: On my ender 3 using Cura I sized to 150%. I took off retraction like others had suggested, and that was THE WRONG DECISION. The skull printed ok but it was filllled with strings. In each of the tiny windows, and in the main part for pencils. Next time I will be using the 'max retractions' feature in Cura that limits the amount of retractions done on a small length of filament to avoid it being chewed up. This means it will retract most of the time, but it will still skip some and have minor stringing. Awesome design though! Tried out my translucent blue Solutech PLA filament on this.