Warning to Cura users, Cura 5 inexplicably removed "fill gaps between walls" and "fill tiny gaps". You will now need to set the "Minimum wall line width" to achieve solid parts, this
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Version 4.2.1 Wall Thickness: Is grayed out in box and does not reflect the correct wall number thickness, even when changing numerical values. · Issue #6406 · Ultimaker/Cura · GitHub
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