Underextrusion
If your prints start to have gaps in the walls, you are likely experiencing underextrusion. Follow this troubleshooting guide to diagnose the issue and fix it.
Extruder/Hotend Issues
First, try the solutions in this article in case there are any issues with your printer's extruder/hotend.
3MS rotation_distance
If your extruder and hotend are working fine, the next likely cause of underextrusion is your 3MS rotation_distance is too high. There are two likely causes and solutions, based on where in the print the underextrusion occurs:
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Whole print - 3MS motors working backwards from the extruder or not working at all
Follow the wiring section of Assembly.
Follow the first two steps of Stepper Setup.
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Partially through print - 3MS motors not turning enough
Follow the last step of Stepper Setup.