Can I apply for a multi-entry Non-O visa before my current extension expires?

The user is currently on a marriage-based extension of their Non-O visa, set for renewal in August. Since they cannot extend due to financial constraints, they are considering traveling to Ho Chi Minh or Savanakhet to apply for a new multi-entry Non-O visa. They seek clarification on whether they can leave Thailand to obtain the visa anytime before their current extension expires or if they need to wait until 30 days before the expiration. Responses suggest that leaving the country to obtain a visa does not affect the current extension, but exiting Thailand without a re-entry permit will lead to the cancellation of the extension.