1 Topic by tealvince

  • tealvince
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Topic: Which thermistor table for bargain J-Head?

Instead of jumping on the E3D bandwagon (which is an excellent choice for most I might add), I decided to try some bargain J-Head hot-ends instead.  My thought is that I'd like to treat my hot-end as a swappable and sometimes disposable component, so that if I run into a clog, burnt heater, or other problem I can simply swap hot ends and adjust the bed and keep printing instead of having to stop mid-project to fix it, clean it out or soak in acetone.   It also means I might be able to quickly start a new print job cold in a new color just by swapping hotends with the filament already attached.

I got a pair of them for $33.99 with free shipping here:

http://www.buyincoins.com/item/36540.html
http://image1.buyincoins.com/bicv2/product/s0/1378374028_6534.jpg

Now that they've arrived, I think I need to recompile the firmware setting correct the thermistor type, right?  Am I correct that I should set it to table 5/  I found some online refs mentioning this, but that the "original" thermistor used table 1.  I presume this is for an older J-Head, not this one, which is sold as an MK-V.

Also, while I'm at it, can someone please confirm that a J-head cartridge heater can be used with the standard SD2 power supply?  I've seen one previous reference to this in a thread but it doesn't hurt to make sure.

2 Reply by saymo606

  • saymo606
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  • Registered: 2012-12-05
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Re: Which thermistor table for bargain J-Head?

I've used j heads in the past and always used table 1 and heat to ~ 230 deg.

have used numerous 40w cartridges on an SD2 and SD3 with no probs... some say it takes the PS to its design threshold, but for me it has never been an issue...

danny did the original write up for using a cartridge over a year ago and he mentioned then in his post that there is no need to upgrade... might be different from machine to machine... for me it was fine on both SD's smile hope it helps!

3 Reply by tealvince

  • tealvince
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Re: Which thermistor table for bargain J-Head?

saymo606 wrote:

I've used j heads in the past and always used table 1 and heat to ~ 230 deg.

Thanks!  I don't have the source code in front of me.  Is that the same table as the standard hot-end (i.e., I don't need to update the firmware)?

4 Reply by Rincewind

  • Rincewind
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Re: Which thermistor table for bargain J-Head?

tealvince wrote:
saymo606 wrote:

I've used j heads in the past and always used table 1 and heat to ~ 230 deg.

Thanks!  I don't have the source code in front of me.  Is that the same table as the standard hot-end (i.e., I don't need to update the firmware)?

I use the same table as stock with your hotend and never destroyed anything.