Question Cura is not slicing my print properly

[Master390 0]

I made the spacers to secure my arduino board to acrylic sheets. the problem is that Cura is not slicing it properly. This is a screenshot of what is happening.

[GregValiant 1,330]

Those are really small.  You my be falling below the threshold of what you can print.  Does the printer have a .4 nozzle installed?

If you go to the Custom settings and make all the settings visible then you will have a lot more options.  You can try dropping the line width to .35.  Those are really small though and you might need to go to a smaller nozzle.  You can change the nozzle size in Cura and see if it helps.