PRINTING ERROR I can print stamps, but I can't print shipping labels

SOURCE: Dymo LabelWriter 400 Turbo/Postage Issue

Yes, you are indeed doing something wrong. In terms of the "free" electronic postage offer, what you want to sign up for is the "DYMO Stamps" program, offered via endicia (this is different from endicia's other PAID programs...just be aware).

Simply put, just google "dymo stamps" and the first hit will bring you right to the sign-up location you want.

Just to clarify, unless you have a special program I'm not aware of, stamps.com is most definitely NOT free. They require a monthy fee (of course, they do have a free first month if that's what you're talking about). Regardless, stamps.com DOES work with the LabelWriter 400...but just not with the special "Dymo Stamp Labels" (these "stamps" only work with the free monthly servcie I mentioned earlier, "DYMO Stamps"). You can print up postage/labels via stamps.com just fine using the other size 2-part or 3-part labels sold via stamps.com or dymo.com's store.

good luck!

SOURCE: just changed labels to 99010 and can no longer print

Did you change the label type in the printing preferences?

SOURCE: Dymo Twin Turbo Labelwriter not printing stamps

This is the response from dymo stamp. I did as they said and am now printing stamps again.
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We have seen this cause problems with the .NET framework Microsoft uses and Dymo Stamp uses. Follow these steps to correct it Step 1: Download Microsoft Windows Installer CleanUp Utility
============================================
1. Visit:
http://download.microsoft.com/download/E/9/D/E9D80355-7AB4-45B8-80E8-983A48D5E1BD/msicuu2.exe
2. Save the file on the Desktop.
3. Please double click the msicuu2.exe file to install it on the computer.
Step 2: Remove .NET Framework
========================
1. Click Start -> (All) Programs->Windows Installer Clean Up.
2. Please locate and remove Any .NET Framework 2.0 software.
After that, please perform the following suggestions to reinstall .NET
Framework 2.0 and its updates. Step 3: Reinstall .NET Framework Version 2.0 SP 1
================================================== ==============
Please download and install the following

Microsoft .NET Framework 2.0 Service Pack 1 (x86
http://download.microsoft.com/download/0/8/c/08c19fa4-4c4f-4ffb-9d6c-150906578c9e/NetFx20SP1_x86.exe
Note: When the "File Download" window appears, please click Save, and follow
the directions to save the file on the Desktop. After downloading all the
setup files, please double-click on each one to install them.

SOURCE: Dymo Twin Turbo Labelwriter not printing stamps

I would uninstall the software and reinstall it from this link: http://www.labelcity.com/resources/labelwriter-drivers-downloads.shtml

-Ernest

SOURCE: My dymo label writer twin turbo stopped printing on left side!

There are a few common reasons this is problem can exist.

1.) the incorrect template is used when creating the label

2.) the labels are installed incorrectly - the labels must be loaded and pushed against the left side of the printer and lid closed when printing to ensure the labels don't "wander" out of the sensor's view.

3.) the label sensor is covered by some debris - sometimes a label jam can cause a piece of label to become stuck on the underside of the sensor thus blocking its view. 4.) the print head is covered by some debris - sometimes a label jam can cause a piece of label to become stuck on the underside of the sensor thus blocking its view.

5.) The labels are defective - if you have another roll of the same size, try it to see if it has the same issue. If not, make sure you purchase quality labels like Dymo name brand or Labelvalue brand Dymo labels.
6.) The printer is defective. Labelwriter 400s have a 2 year warranty, so you can contact Dymo customer support to determine if the printer is defective and return to the retailer you purchased it from.