Big cracks on the Layer view in the Preview mode of Cura I designed a part on Fusion 360 that looks like this:



The part is very small, about 20&nbsp;mm for 10&nbsp;mm. I'm then importing it to Cura and I notice they are huge cracks on the part when simulating/previewing the print, I'm using a Monoprice mini printer, 100&nbsp;% infill, and 0.0437&nbsp;mm.: 



This is my first-time 3D printing something, so maybe (most probably) I did something wrong.
You have coasting turned on. Cura shows the coasting locations (where extrusion is switched off) as gaps. The actual print may be fine.