LuzBot Taz heats to temp - but drops when print starts

Trying to print on a LuzBot Taz. The head will heat to the correct temperature and I can get some plastic to come through the head - using the command in the software. But when I print the head goes everywhere it should but no filament goes out. The temperature of the head drops precipitously as soon as the head starts its printing routine. Help.

Check your print fan speed in the slicer. If it is set at a high %, it may be over cooling the hotend when the print starts.

If you have an E3D based hotend, the silicone sock generally cures this problem.