Machine rigidity is a big concern, because a flimsy machine will deflect under load, causing poor tolerances and chatter - resulting in poor surface finish. In CNC machining, the machine has to overcome the cutting forces, which will vary based on depth of cut, width of cut, feed rate, spindle speed, type of tool, and the material being machined. As for the 'strategy' of how the slicer chooses to run the extruder for each layer, the basic formula is quite simple - take a slice of the model, do a couple of laps around the perimeters, and then fill in the rest with infill. They achieve decent quality and surface finish by printing at a small layer height, with the consequence being print times on the order of hours for even modestly-sized parts - but 3D printers are quiet, safe and don't make a mess, so a "set it and forget it" approach is fine. The only real stress on the rigidity of the machine is the acceleration forces resulting from the relatively fast movement of the X and Y axes. ![]() ![]() extruding.Ī 3D printer works with negligible resistance - it always prints bottom to top, a layer at a time, and it's essentially extruding into thin air, laying plastic down onto the previous layer. ![]() There are number of factors, but largely it comes down to the physics of cutting vs.
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