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ok, so it sounds like you have not set up your Z height. The height from the nozzle tip, to the bed. The calibration run only sets an even distance from the nozzle to the bed all over the build plate distance so there are no high and low spots. But it does not adjust the nozzle height. When it starts to print, there should roughly only be room for a sheet of paper in between the two. On one of the last pages in the tevo manual, it states how to set the Z height......But I never tried it. This is how I set mine up. The Easy Z height way.....
Install Pronterface. http://www.pronterface.com/
Connect the printer. Write G28 in the command line, and it will home.
Place an A4 sheet of paper on the heatbed.
Write G0 Z0 , and it will lower the hotend close to the bed at zerro Z height.
Use the 0.1 down arrows on the Z axes until the (clean ) nozzle touches the paper, and you cant move it.
The back off 0.1mm with the up arrow. You should now be able to move the sheet of paper, if not, press up again until it is free. Then write M306 Z0 to set this height as the new Z zerro height.
Write M500 to save the new setting to the config ovveride, so it remembers it on next power cycle.
Disconnect, close Pronterface.
Done, Print until you run out of fillament :-)
If you think the layer is a bit too squished, then do the same procedure again, and go 0.1mm higher up, and you should be good to go.
I have used this method as it is described on the smoothieware site for all my prints, and have made some great stuff.