Are you using a particular Power-Up to create the chart? https://trello.com/power-ups/search/gantt Depending on the tool you use, you might be able to print directly from within their interface.
For more on available export options within Trello, please see https://help.trello.com/article/747-exporting-data-from-trello-1
If you had to thrive a new habit during a lockdown, what would it be? Trello
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