The effect of fan quantity and fan shrouds on ‘short’ layers ‘Short’ layers are layers of a 3D print that finish so quickly that the plastic may not cool down before the next layer is printed on top of it. Good cooling is essential when printing these with PLA. I investigated how the number of cooling fans, and the shrouds fitted on them, affected short layer success. in 3D Printingwith 3dprinting