The cross-section area of such voids is generally: So the relationship between desired extrusion width and volume to extrude is the following: Slic3r assumes that the cross-sectional shape of an extrusion is a rectangle with semicircular ends. In this case the problem is: what shape will our extrusion get? We know it will get squashed horizontally, but will it have a rectangular or oval shape? What's the maximum extrusion width we can get with a given nozzle diameter before plastic starts curling at the sides? The required material volume for a path of unitary length is calculated accordingly to the cylindric shape, thus with a circular cross-sectional area: E = (nozzle_diameter/2)^2 * PI Extruding on top of a surface (In case of bridges, we want no overlap because it has proven to drag the existing paths.) Parallel paths will be positioned so that they are tangent, thus the spacing between one path and its neighbor is equal to nozzle diameter as well. Extrusions are round and their diameter is equal to the nozzle diameter. Bridges: the easy caseĪs said above, there's only one correct flow rate for bridging: the one that doesn't make your bridge sag or break. It's not the distance of two adjacent paths since some overlap will be generally applied in order to get better bonding. If, on the contrary, you extrude too much material, the shape of the extruded filament won't change (still equal to nozzle diameter) but you'll get a loose bridge.Įxtrusion Width is the thickness of a single filament extruded either in free air or above a surface. Actually, if you reduce the material flow you'll get smaller circles to some extent, until the plastic viscosity decides it's time to break your bridge because of too much tension.
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