Canon imagePROGRAF TX-3100 36" Printer with Basket - Manual (Page 315)

Thicken fine lines
Performs correction to avoid breaks in fine lines.
This setting item is displayed by tapping in the following order.
Printer settings > Print settings > HP-GL/2 print settings > Line & pen manager
• ON •
Corrects line widths so fine lines are drawn more sharply, without breaking.
The line color is not changed.
• OFF (Initial setting) •
Thin lines are not corrected.
Some line thicknesses may cause them to become broken.
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