Thermistor temps way off

[calabus]

So I managed to melt 2 hotends. One was easily my mistake...the thermistor wiggled out and I didn't notice. The second I was very careful in attaching it and it looked fine. Temps were reporting rock solid although I was relying on Repetier for the readings. Bad idea....the temps must have been way off and at 200c as reported by the software....the head melted again. So now I am on my third hotend. I have carefully assembled it and am quite sure the thermistor is seated well. I guess it isn't seated well enough because my temps are still way off. I bought an external meter and measured on the other side of the hotend where there is another hole for a thermistor. The temp if off by as much as 40c. I'm not really sure what to do from here. I would rather not tear this hotend down as I still believe thermistor is well seated. Is there any way calibrate/adjust the inaccurate reading?

[Batteau62]

geneb talks about this here:
http://forum.seemecnc.com/viewtopic.php ... ngs#p13362

[calabus]

No solid answers there for resolving the issue...other than change thermistors which still doesn't eliminate the 'poor design' (according to the thread) of the stock one. The same problem will probably keep coming up and melting the hotend. The other option seems to using a 3rd party product such as the E3D hotend. This is what i'm going to try. Being new to this sort of thing i'm unsure what mounting hardware i am going to need. If it involves printing a part....well i'm screwed.