Unanswered Holes in print

Hi,

I am both new to 3d printing as well as the Robo R1. I have notices in almost every print there are sizable gaps between some of the lines, and in some cases holes that go through the entire print. This is often most noticeable where the perimeter lines meet the lines used to fill it in on a flat print.

This is a hand me down printer from a friend who changed out the hotend assembly to the E3D. It also has the print from SD option with the LCD screen.

Are there any settings that typically impact the closeness between the lines that I could play around with?

 

Thanks! I will check this out Much appreciated. I am using matter control but I am exporting to SD card, not printing directly from there.