I have a Zebra Stripe 600. I am trying to print a

CLICK HERE to download the full user manual from Zebra. If the link doesn't work, go to Zebra.com, click Resource Library at the top of the screen, then click MANUAL. Choose your model number then follow the prompts.

you need to calibrate label snensor and enter correct values for label dimension

He are the steps you need to calibrate your printer

Label Length Calibration
Note: This is typically the only procedure required when first installing the labels.
1. Load the printer with media and ribbon.
2. Press the printer front panel MODE key until the CALIBRATE LED is lit.
3. Press the FEED key and allow the labels to feed.
4. When the labels have stopped press the MODE key once to save the value in memory.

For the cutter to work it is necessary to instruct the printer to "Use the cutter" This setting is usually accessible in the printer driver. Your label program interacts with the printer driver. Ensure that the cutter option is selected in the printer driver.

recalibrate the printer in the set up.
Don't just do a quick cal from the front panel.
Make sure your driver is the correct dpi zebra driver, either zebra or my preferred seagull scientific.
by .5 of the label, do you mean width or heigth.
If it is heigth, check to make sure you are set for top of print correctly. Also you will have to back feed for a label that short.

Try to use this driver in www.seagullscientific.com, it is better that zebra driver.

Look at this I think it will help.

I Use driver from Nice Labels
http://www.nicelabel.com/downloads/nicedrivers/zebra seems to work fine

Please download a new driver from www.zebra.com (don't use your old windows driver) and then this will fix the problem.

Mmmm a-Jamone