Exruder Temp Drops While Printing

I have a melzi ardentissimo board running sprinter and an all metel hotend(probably some knock-off) and its cooled. I'm using a bowden extruder witha tube for feed. i haven't had any problems with this set-up but the last few prints I've tried. The hot end gets up to temp and as it starts to print, it start to cool until the plastic can't extrude. Any Thoughts?

Thanks Adam

Hey Adam,
i guess problem is your heater cartridge, probably it is damaged.

remove your heater cartridge try out with multimeter. How many amps using by heater?? If you have 12V 40w standart heater, it must be using 3-4 amps, but after 1-2 minutes your amps go down, probably your heater damaged.

Edited 1 time(s). Last edit at 09/04/2014 08:30AM by RDEng.

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Custom 3D Printer,

Mechanical Engineer