Wobbly Hot-End Temp

Hey,

I did a print today and my hot-end temp is all wobbly (See Attachment)

What is wrong and how do I fix this?

Thanks

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NFireLabs - The World First Modular 3D Printer - At An Affordable Price!

Maybe thermistor is not mounted properly and when your fan blowing at the thermistor, the temperature drops?
Not sure how is thermistor mounted in e3d v5 - if it's (as in v6) screwed in with a wide screw - I'd check if it's tight and no gaps to actual thermistor chamber.
If it's glued in (as in jhead)- I'd check the glue - maybe it's worn or something.
Similar thing happened to me with j-head, shortly before the actual glue fell apart and thermistor came out of the heatblock, but moving fan so it didn't blow at the thermistor helped in the meantime.

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/Larry
(www.filamentshop.ie)

That's too regular of a rhythm for it to be a loose wire. My guess is that your PID values for the hot end are incorrect. You don't say which firmware you're running, but I assume it's Repetier?? I don't know repetier, but marlin has an autotune feature that alows you to get a good start with PID. I assume repetier has something similar.