I had problem with dymo, so we printed receipt thru other printer and now got dymo fixed, so i tried to print, but it's not printing, i looked in printer que, there's some printing items that i cann't get cleared. i think this is why i cann't print. i don't know what to do

Sounds like one of the thermal contacts is dirty or burnt out. Check with DYMO though. They used to make a cleaning strip that you could run thru Thermal printers to clean off the residue...

See if it still happens using a fresh label roll. From the Dymo 450 User Guide the common causes of poor print quality issues.

Poor print quality is most frequently caused by one of the following:
• An old roll of labels
• Labels made by a manufacturer other than DYMO
• Labels where the thermal coating has been compromised
• A dirty print head
First, make sure you are using DYMO-branded labels. Do not use third-party labels because the thermal coating on other labels has a different sensitivity than DYMO-branded labels. Also, the perforated holes between the labels made by other manufacturers are frequently not detectable by LabelWriter printers.
If the print quality becomes faint, small dots of white appear scattered through the printed characters, or light and dark patches of printing appear, you are probably using a faulty roll of labels. Try using a different roll from a fresh box. If the second roll prints correctly, the problem is with the first roll of labels.
Another possibility is that the LabelWriter print head needs cleaning. Every LabelWriter printer comes with a cleaning card. See "Caring for Your Printer" on page 17 for information about the
LabelWriter cleaning card.

Here is the fix for Win7 provided by Dymo tech support:
1. goto Devices and Printers
2. select Dymo Label Writer
3. On the top where you see Print Server Properties, open it and find "30252 address"
4. delete "30252"
5. delete Dymo Label Writer printer
6. disconnect USB cable and then power to Dymo printer
7. connect power and then USB cable back to Dymo printer
8. reboot PC
9. try printing label again.

https://dymo.custhelp.com/app/answers/detail/a_id/1343/~/failed-to-convert-devmode-to-print-ticket-error-when-printing-from-dymo-label

These Dymo LabelWriters are thermal printers which uses heat to print the labels, not ink. Be sure you are using labels compatible with your Dymo printer.

I had this problem with the LabelWriter 450 Turbo and it was a .Net Framework problem.

1. Uninstall the Dymo Label software
2. Click this link to download .Net Framework 4.0 http://www.microsoft.com/downloads/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en
3. Reinstall latest version of your Dymo Label software (w/o printer connected to PC)
4. Reconnect label printer when prompted by installer

This should fix the problem

OK! The first time you tried to print ON THE LEFT SIDE, without anymore labels there, there was a "pending" error message in the print queue. This typically cuts off all furtther printing, as all subsequent requests are "behind" it in order or priority.

To fix this, open the Dymo Labelwriter "Printer" dialog box (double-click it on the tray or go to "start / control panel / printer and faxes" - then double-click on "DYMO LabelWriter Twin Turbo". Once open, you'll see a list of "failed" print requests. Somewhere in there you'll find the one with the "laserwriter output" out of paper message. Select that and cancel or delete it.

If this was the problem, all your attempts will now print (make sure you have enough postage paper in, and you'll have extras you can use, I'm sure!

Hope this helps.

This is due to the print template you have chosen.

control panel > printers > right click dymo print icon > properties > press "printing prefrences" in General tab > click "Advanced" button in layout tab

Here you can choose the paper size. The dymo "shipping label" (30573) sold in most office stores is template number is "30323 Shipping".

Also these templates choices are available in the software you are using to print the labels under file -> print setup or whatever your software calls it..maybe "print setup"
Hope this helps.

New versions of the Labelwriter 400 (original and Turbo) do not take Generic Labels. It is an issue with the firmware Dymo have installed - it will only read the genuine labels made by Dymo. currently there appears to be no work around to solve this isses.
The Dymo OEM labels have lines print on the back, if you use labels without these lines, the printer gives an "out of paper" error
The only printers in the Dymo Range that will take our generic labels are the Dymo Twin Turbo and the Dymo Duo (both the more expensive from the range).
Dymo have only made this change in the last 6-8 months, old 400's will work with cheaper generic labels

Disconnecting power and re-connecting will work, but only temporarily.
In order to fix, you need to upgrade the printers firmware...

Windows...
http://www.dymo.com/media/Software/LabelWriter_Firmware_Updater_Rev_AG104.EXE

Mac...
http://www.dymo.com/media/Software/LabelWriter_Firmware_Updater_2.zip