Hotend temp - fluxtuations

I noticed that

when I watch the hotend temp on the LCD display.. it jumps wildly.. its set to 245 and it might jump down to 239 and then to 250 within 1 second.

I doubt that is physically possible for the nozzle to actually swing that much that fast with the heater we have. I would hazard a guess of poor thermistor contact with the block.

I have a E3D v6 the thermistor is screwed down

I would perform PID tuning/calibration.

Be sure you have the correct thermistor selected for the E3D (1 I belive) and then run the following command from Pronterface:

Quote:

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M303 E0 S200 C8

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This will run the self PID tuning and you will have three values in the Pronterface console to plug back into Marlin on the appropriate lines.

See this site for a more in depth description or watch Tom's guide here (Highly recommended).
swirvbox

E3d thermistor is 5

And you should pid auto tune the temp you plan to print at which is the S value

You are correct. It is 5. Derp. I print at anywhere between 185 and 270. Not on the i3v however. I have not had the hexagon up that high yet. I am still not as confident with that hotend as I am with my E3D.

I have already had to reseat the heater to the heat break once already with the Hexagon. What a mess it made as it puked plastic from the top of the heat block.

swirvbox

Yeah i had that happen too... I am saving my hexagon for my kossel i am building its a nice light all metal hotend.