# Do Cura's self-crossing infill patterns account for excess material from self-crossing?

As far as I can tell, Cura's infill patterns which are self-crossing, such as triangles, don't do anything special to account for extruding material over the crossing points multiple times. In theory this should produce either a blob around the crossing point, or excess pressure in the extruder due to blockage from the alread-deposited material that will result in over-extrusion after the point is crossed until the excess pressure is dissipated.

Is Cura doing anything to account for this? It doesn't seem to do travel moves across the intersection, but maybe it's adjusting the overall flow to compensate for the crossings "on average".

If not, it seems like crossing points near the walls would be a source of dimensional accuracy problems, which I've seen in tightly confined areas and which I'm looking for a root cause for.

• Regarding When the nozzle extrudes the second direction, it pushes the lines laid by the first direction out of the way could you explain why it pushes it away (I never see this happen, nor ever heard it does), the OP hints to not pushing it away as the second pass it cannot extrude (as the top of the first pass line is on the same level as the bottom of the nozzle), causing a hick-up in flow and build-up in pressure. – 0scar Jul 4 '19 at 10:28