The Hot Bed thermistors are the one’s typically in the glass housing?
Like my link example
http://www.ebay.com/itm/171104146390?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648
The picture doesn’t really do much justice to what these are/might be. Hot bed thermistors are the little glass bead type, typically but there are larger and smaller versions. A lot of people have moved to the smaller versions because the insulative properties of the larger versions can lag the reading a bit. Smaller ones are also a big pain in the butt to work with as far as attaching leads goes though.
If you’re asking if those will work: Yeah, they will. You’ll want to pick up some teflon wire tubing to insulate the bare leads from one another so they don’t short out. You can also use kapton if you have some.
Also, stay away from the 5% toleranced thermistors. You want the 1%-ers like the kind you linked.
Thanks for the info Anthony Morris. Would you have a link to the smaller ones?
I had bid on some on Ebay then after i realized there were 10% and the auctioneer was nice enough to let me out of the auction.
https://github.com/ErikZalm/Marlin/blob/Marlin_v1/Marlin/Configuration.h - Look around line 117 for that list of thermistors, and search for those part numbers. That’s going to be your best bet (or getting them from a place that will tell you the thermistor profile to use under Marlin). I’ve never had to order them myself, I got a handful of EPCOS 100k’s passed down from a friend so I don’t have a link. I’m sure someone in the community will pipe up with a recommendation soon.
The ones you linked are fine for the heated bed, I honestly prefer them.
There is a number of choices there i can search, Thanks for the info
With respect to joining the wires on these things, get hold of some 1mm open ended ferules and use them to crimp the thermistor wires to the ones leading to the electronics board. Much easier than soldering! A good walk through of the process is provided in the E3d hot end manual: https://docs.google.com/file/d/0B6KAo0Xfa5LfVnFPa3R3Znl0aVk/preview
Even though i am using this for the bed a suspect the procedure is the same. I am curious as what would be a disadvantage of soldering?
If the bed overheats, your solder can melt. Its an unlikely scenario, but possible. Its more important on hot ends because the operating temperature is hotter than the melting point of solder.
Ah gotcha makes scene.
As long as you keep your solder joints a couple millimeters away from the heater block, melting won’t be an issue at all (even printed Polycarbonate with soldered-on wires). I actually prefer soldering to crimping since the solder joint can not slip under any circumstances.
I am with you Thomas, I would prefer to solder. I have seen far more bad crimped connection than soldered ones.
You can always solder the crimp, using the crimp to hold the wires together so you don’t need four hands :]
@Tony_Olivo . Yep, crimp then solder. Much easier.