Printer says it's out of paper but it isn't

Envelopes must be fed from the Auto Sheet Feeder. Use either European DL or US Comm. Env. #10-sized envelope.
Important :

• You need to print from the computer to print on envelopes.
  
• Do not use envelopes with embossed or treated surfaces, a double flap, pressure seals, or sticker flaps.
  
• Select either DL Env. or Comm. Env. #10 in the printer driver according to the envelope size you are using. If you do not, the address will be printed in the wrong direction.
  
  

1 : Retract the Paper Support.

2 : Load the envelope against the Cover Guide (the right side of the Paper Support).
Load with the front face UP and the rear flaps DOWN on the left.
A maximum of 10 envelopes can be loaded at once.
*1 Printing orientation
*2 Make sure the flaps are folded.
Important : Make sure that the Cover Guide is set upright.

3 : Pinch the Paper Guide and slide it against the left side of the envelope.

4 : Press the Paper Feed Switch so that the Auto Sheet Feeder lamp lights up.

5 : Set the Paper Thickness Lever to the right.

In the printer driver, select 'Envelope' in Media Type, and then select 'DL Env'. or 'Comm. Env. #10' in Page Size.

1. Do the following
   
   Open the paper support and extend the paper support extension.Open the paper output tray. Set the paper thickness lever to the right side for envelopes.Load envelopes in the auto sheet feeder with the print side facing up. Check the printing direction.Set the envelope in the direction of the arrow.Set the envelopes to the right side of the auto sheet feeder.Pinch and slide the paper guide to the envelope's left side .
   

This should be in your manual complete with pictures.

You can print a single envelope using the photo/envelope feeder. Insert the envelope into the photo/envelope feeder with the side to be printed facing down and the flap to the left.

You can print multiple envelopes (max 20) from the bottom tray. Temporarily remove the top (output) tray. Slide the paper guide in the bottom tray to the left. Load your envelopes to the far right with the side to be printed down, flaps to the left (I like to tuck the flaps into each envelope so they are less easily jammed, but this is optional). Slide the paper guide to the right snugly against the envelopes. Replace the output tray. Start printing.

In the paper-handling menu set the envelope feeder size to the size of your envelope and the envelope feeder type to *any type.

Then ensure you are printing envelopes from your application.

I print envelopes a lot for my business.
What I do is I use the regular paper feed, and I open the flap on the envelope so that it's flatter. Simply slide the paper guide to adjust to the size of the envelope.
Also, typically the orientation for printing envelopes is sideways. You put the left edge of the envelope in the printer first. If you are unsure of the orientation, simply do your first print on plain paper. Then you'll know how to insert the envelope.

You have to either use the MP Feeder or an Envelope Feeder. When you send the job to the "Manual Envelope" option, it will beep and prompt before each envelope is printed. Same will happen when you use the "Manual Paper" option.

You will have a hard time printing 1000 envelopes. The printer will print a rated engine speeed for the first 6-10...After that, the narrow media sensor will force the printer to slow down and you will proabably get 5-6 envelopes printed per minute.

If you look closely at the very front of the paper tray, just to the left of the sliding thing that keeps the paper from drifting out of the front, you will see a couple of illustrations showing how to position envelopes in the paper feeder. For regular letter-sized envelopes, or even greeting card envelopes, place them face down with the top of the envelope pointing to the left as you are facing the printer. The return address area should be away from you. Position the envelope all the way to the right side of the paper feeder, then gently slide the envelope all the way back until it is stops so that it is accessible by the paper feeder. Bear in mind that it will be flipped over when it comes out. To avoid wasting an envelope, do a trial print on a piece of paper to make sure you understand the positioning correctly. Good luck!

Table 3-7. Paper Handling Menu
Item Values Explanation
ENVELOPE FEEDER
SIZE=COM10
For supported paper sizes
see page 1-12.
This item appears only when the
optional envelope feeder is installed.
Set the value to correspond with the
envelope size currently loaded in the
envelope feeder.
ENVELOPE FEEDER
TYPE=PLAIN
For supported paper types
see page 1-12.
This item appears only when the
optional envelope feeder is installed.
Set the value to correspond with the
envelope type currently loaded in the
envelope feeder.
TRAY 1 MODE=
FIRST
FIRST
CASSETTE
Determine how the printer will use
Tray 1.
FIRST: If paper is loaded in Tray 1,
the printer will pull paper from that
tray first.
CASSETTE: A paper size must be
assigned to Tray 1 using the
TRAY 1 SIZE option (the next item
in this menu when TRAY 1
MODE=CASSETTE). This allows Tray 1
to be used as a reserved tray.
TRAY 1 SIZE=
LETTER
For supported paper sizes
see page 1-12.
This item appears only when TRAY 1
MODE= CASSETTE. Set the value to
correspond with the paper size
currently

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Solution --> Phaser 4400 Printer: Printing envelopes

Printing EnvelopesEnvelopes can be printed from the optional envelope feeder, the Multi-Purpose Tray, or Tray 1, 2, or 3.
Guidelines for envelope printing

• Use only paper envelopes.
  
• Do not print on the back of the envelope.
  
• Never use envelopes with windows, metal clasps, or exposed gummed surfaces.
  
• Keep unused envelopes in their packaging to avoid the effects of moisture and dryness, which can affect print quality and cause wrinkling.
  
• Envelopes may wrinkle depending on weight and stiffness of the envelope.

Many applications include a tool for creating an envelope document. For example, Microsoft Word includes an Envelopes and Labels feature in the Tools menu. Be sure to:

• Select faceup.
  
• Clear Clockwise Rotation.
  
• Select the feed method with the image centered and the stamp on the envelope to the upper left.

Never use envelopes with windows, metal clasps, or exposed gummed surfaces; they can damage the printer. Damage caused by using unsupported envelopes might not be covered by your printer's warranty.
Note: The heat from the printing process can melt certain types of envelope glue. If the envelope flap sticks shut after printing the test print, tuck the flaps inside the envelopes when printing the remaining envelopes. Printing envelopes from the envelope feeder

1. Insert the envelopes into the envelope feeder. For more information, refer to the Trays section of the Trays and Paper Guide on the Interactive Documentation CD-ROM.
   
   • Place the side to be printed faceup.
     
   • The top of the envelopes should be toward the left of the printer.

On my MP780, be careful to select the appropriate paper type; I was getting black smudges on the left side of my envelopes until I explicitly set that my paper type was "envelope" from "plain paper".  
Another idea is to adjust the "ink drying wait time" to a higher level.