Elmoret, would something like this be better?   http://www.mouser.com/ProductDetail/Arc … qY6dBoQ%3d

Yes, but if you're going down that road you might as well use the 100W series. Keep in mind you'd probably have to drill new holes.

Edit: Measured draw is ~47 watts. It's 3.3 ohms for sure.

If its 3 ohms, then:

P=V^2/R=48 watts, and its rated at 50watts. If the supply voltage is just 12.3v, then you're over the limit already, which is why it's burned up.

Furthermore, that rating is when the resistor is attached to a heatsink @25C. I don't think many of us run the bed at 25C.

I'm becoming increasingly disappointed in SD's design practices.

Measureing at the spots on the plug I get about 5.8 ohm.  I also stuck the probs under the white insulation pad and probed the copper looking block and got around 1.1 ohm.  This was with the Solidoodle off and unplugged.  I assume that makes no difference.

After I made those measurements I took the bed off by unscrewing the addjustment screws.  I think probed the two solder connections on the heating element.  I get a reading on my multimeter of .928 M ohm.

Just tried it again and got 0 ohms on the actual connection that the wires are soldered to.  I looked up the part number stamped on the resistor (HS50 3R F) and ordered a couple from Mouser.com.

You've got a lot of different measurements for what should be consistent. Can you post a picture of what you're measuring?

Not sure what resistor you mean, either. The fact your bed measured at .928Mohm is bad news.

After I made those measurements I took the bed off by unscrewing the addjustment screws.  I think probed the two solder connections on the heating element.  I get a reading on my multimeter of .928 M ohm.

Just tried it again and got 0 ohms on the actual connection that the wires are soldered to.  I looked up the part number stamped on the resistor (HS50 3R F) and ordered a couple from Mouser.com.

I think my temperture drop is a bad bed.  The bed won't heat up at all now.  I checked the two black wire terminals on the electronics at the back.  The ones on the left as you're looking at the electronics.  They both report 12.74v DC so I think I'm getting power.  Anyone else have tests I should do or a fix?

Edit,

I just found Ian's picture of the electronics and realized I was checking the lights.  The heaters are the red terminals at the bottom of the board as you're looking at them.  The right hand terminal (which I assume is the hot end because it still works) is getting 12 volts.  The left hand terminal is getting about .3 volts.  So, do I have bad electronics that need to be replaced or is there a fix I can try.

Disconnect the bed from the board, and measure its resistance.

Edit,

I just found Ian's picture of the electronics and realized I was checking the lights.  The heaters are the red terminals at the bottom of the board as you're looking at them.  The right hand terminal (which I assume is the hot end because it still works) is getting 12 volts.  The left hand terminal is getting about .3 volts.  So, do I have bad electronics that need to be replaced or is there a fix I can try.