I've been using the printer with the default 0.4mm nozzle, and a layer height of 0.25mm and getting good, consitent results. I do have a smaller nozzle which I'll try at some point, but I'd like to start playing with the settings slightly to see how the prints differ. So, firstly I've been looking at adjusting the layer height. Is this something that I can safely adjust? I read somewhere that says that it's okay to have a layer height of 1/2 to 1/4 the size of the nozzle (0.1 to 0.2mm), but I'm also aware that if it's too low, then I could have problems with thermal runaway or other issues with extrusion. How much is it worth changing this setting? Another, slightly related thing I wondered was after watching a recent YouTube was on contamination from dust, and filtering the filament as it extrudes ( ) - how sensible is doing something like this?