first layer why is the infill like this

as the title says

It looks to me that either you don't have the Z=0 height set accurately and the head is starting too high, or you are under extruding due to not having calibrated the extruder steps/mm, or the extruder is skipping steps (which you should be able to see and hear) when printing infill but not at the slower speed at which the perimeters are printed.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Maybe try upping the first layer width? I use 225%

I agree with DC42, you'll need to balance the z offset (getting a correctly extruded layer height and width) and adjusting the extrusion multiplier (make sure you've calibrated E steps). Try printing a single wall test cube and measure the wall width with a digital caliper, see if it matches the set extrusion width.

Setting a wider first layer created other problems, and will still under extrude. The extruded filament will be wider but the gaps remain the same.

See:
Zennmasterm extrusion tutorial

Edited 1 time(s). Last edit at 09/02/2015 02:42PM by imqqmi.

Looks like incorrect Z homing, with the layers not smushed enough

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Master Tinkerer