Re: Thermistor insanity
Posted: Sun Jul 01, 2012 9:46 pm
So, anyways, apparently i didn't tighten the SS part into the nozzle tight enough (i did use two wrenches / two hands to do it, but neglected to heat the part up and retighten).
Having no other means to extract the PLA out of both parts, i've ended up torching it.
And then crap started happening, pretty much in succession...
First, the set screw that holds the other end of the SS tube in the cold end snapped in two (along the slot). I guess i'll leave it like that until i need to dismantle the hot end again, it's removable with pliers.
Then the fire cement just fell off the heater block, along with the thermistor (it cracked along the "wings" i've made to hold it on there).
Then a wrench slipped a little and dented a corner of the SS tube base. Not the tube itself, luckily, and only the part of the thread that's actually never screwed into the heater block.
Being out of fire cement and not having any high temp silicon sealant, i've glued the fire cemented thermistor back in place with some thermal epoxy (Arctic Silver). According to someone on reprap forums, it's pretty stable up to 250 deg C, despite the official page (which is actually a copy/paste of a generic text about epoxy, as i found out) vaguely claiming it goes to >150 deg C.
We'll see how that goes, i'm waiting for the epoxy to cure, it's still in gel phase.
Having no other means to extract the PLA out of both parts, i've ended up torching it.
And then crap started happening, pretty much in succession...
First, the set screw that holds the other end of the SS tube in the cold end snapped in two (along the slot). I guess i'll leave it like that until i need to dismantle the hot end again, it's removable with pliers.
Then the fire cement just fell off the heater block, along with the thermistor (it cracked along the "wings" i've made to hold it on there).
Then a wrench slipped a little and dented a corner of the SS tube base. Not the tube itself, luckily, and only the part of the thread that's actually never screwed into the heater block.
Being out of fire cement and not having any high temp silicon sealant, i've glued the fire cemented thermistor back in place with some thermal epoxy (Arctic Silver). According to someone on reprap forums, it's pretty stable up to 250 deg C, despite the official page (which is actually a copy/paste of a generic text about epoxy, as i found out) vaguely claiming it goes to >150 deg C.
We'll see how that goes, i'm waiting for the epoxy to cure, it's still in gel phase.