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Open the front of the printer to find the MP tray. Fold it out and adjust the paper guides to fit your envelope. Open the back of the printer and flip down the two grey levers (can feel like you are forcing them down, they're not flipping down easily). Leave the green levers alone. This configuration gives you a straight-through paper path that does not bend the envelope too much. Just be aware that the envelope may fall out of the folded-down tray in back.
Sorry, there was a problem. Please try again later.I’m sorry to hear that you are having envelopes printing issues with the Brother MFCL3780CDW. I sincerely apologize for any inconvenience this issue may have caused you. We can help with that. I have included a link to the FAQ answer that should assist you. Please follow all the steps listed in the following link: Answer Link: https://support.brother.com/g/s/id/htmldoc/mfc/cv_dcpl3520cdw/use/html/GUID-F1B1256A-6BAD-4F20-9257-8526539AB033_1.html?c=us&lang=en&prod=mfcl3780cdw_us_as&KEY=print%20envelopes If you still have difficulties, please contact Brother Customer Service at: https://www.brother-usa.com/support/MFCL3780CDW
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