SoliForum - 3D Printing Community — Bed will not heat

Re: Bed will not heat

null@example.com (blarz) — Sat, 08 Nov 2014 00:09:48 +0000

How is your board holding up with the new mk2a heatbed? I have already updated my power supply as the original died a month after receiving the sd3. So that part of the equation is covered. I'm just wondering how your board is holding up, also did you have to place a thermistor under the board to register temps? I have an mk2a board here, for another project, currently collecting dust and I'm afraid of burning out my board with connecting it directly. My sd3 is using the sanguino board. Any help would be greatly appreciated.

Re: Bed will not heat

null@example.com (n2ri) — Wed, 05 Nov 2014 03:49:56 +0000

pascal wrote:

Thanks for the advice, n2ri, but I'm quite certain the problem is a burned-out connector to the motherboard. Check out the photo in the dropbox link earlier in the thread to see the evidence :-)

yeah saw that after posting but figured it may help others trouble shoot as it is another possibility of failure.

Re: Bed will not heat

null@example.com (pascal) — Wed, 05 Nov 2014 03:15:38 +0000

Hey MacGuyver20, would you mind sharing where you purchased your MK2a bed and power supply? I'm seriously considering using this as an opportunity to upgrade my bed as you suggested. Thanks.

Re: Bed will not heat

null@example.com (pascal) — Wed, 05 Nov 2014 03:12:02 +0000

Thanks for the advice, n2ri, but I'm quite certain the problem is a burned-out connector to the motherboard. Check out the photo in the dropbox link earlier in the thread to see the evidence :-)

Re: Bed will not heat

null@example.com (n2ri) — Tue, 04 Nov 2014 02:53:12 +0000

did you check wires hanging from board to heater under bed? likely when print ended and bed lowered for removal a wire connection failed is all. those wires wont flex forever without cracking either at an end or inside insulation at a bend like mini chrismas lights do after a few uses and being re-wrapped for storage.

Re: Bed will not heat

null@example.com (pascal) — Tue, 04 Nov 2014 02:49:04 +0000

Update: I was actually able to pry the connector off of the motherboard with a pair of pliers, and--miraculously--it appears that the mother board is not damaged. I just need to replace the connector from the heat bed to the motherboard, which Solidoodle's support is offering to do. I'll post back with how this ultimately works out...

Re: Bed will not heat

null@example.com (pascal) — Sat, 25 Oct 2014 00:48:30 +0000

Got it. Thanks, jagowilson, I really appreciate all the help!

Re: Bed will not heat

null@example.com (jagowilson) — Fri, 24 Oct 2014 04:40:10 +0000

You will probably have to desolder the header from the motherboard, unfortunately. When I blew my MOSFETs from shorting my old board, the bed heater header pins fused with the contacts in the molex on the end of the cable. If this is what happened in your case then there's no way around it, you'll likely be cutting wires, crimping a new molex on and soldering a new header. Sucks. Any other option really isn't safe unless you want to take this time to do a motherboard upgrade. The heaters carry a lot of power, which is why they are the thickest wires in the printer. Salvaging the current board will require soldering no matter what avenue you take, because at the very least you have to replace the MOSFETs.

Re: Bed will not heat

null@example.com (pascal) — Thu, 23 Oct 2014 14:48:12 +0000

Thanks for the advice, MacGuyver20. Anyone have any recommendations for how to get the pin connector off the motherboard? I'm afraid I just rip it off I'll do some damage...

Re: Bed will not heat

null@example.com (jagowilson) — Tue, 21 Oct 2014 21:37:24 +0000

Nice work! By sliders do you mean the Y rod in the back? I kinda wanna replace the bushings in mine with ball bearings. How did you do it? I'm not sure how to remove the existing bushings or how to correctly fit the bearings in the holes on the side. Considering doing the other bearing mod, but I'd feel so much more pro replacing the bushings.

Re: Bed will not heat

null@example.com (MacGuyver20) — Tue, 21 Oct 2014 15:15:00 +0000

So I had the same problem where the bed would not heat up. After a lot of forums and information and tinkering I found out the original heat beds were not designed to go above 80 C. I burnt mine up. But I replaced it with a MK2a bed. I also had to replace the Power supply 360w 30A. The final product is so worth it. I have not had a single warping issue and or bad print due to sticking since. The price for the bed and powersupply $40.
I also use a glass bed on top, with ABS glue (Acetone with ABS mixed in)

I also added an enclosure and replaced the standard sliders with a more rigid ball bearing setup.

Re: Bed will not heat

null@example.com (jagowilson) — Tue, 21 Oct 2014 01:17:00 +0000

See the things sticking up right next to the extruder heater and bed heater pins? Those are the MOSFETs. They come in all kinds of sizes and are used for a variety of purposes. The ones on the board are big, you'll notice they carry a lot of power because they have little heatsinks on the top. Wikipedia for more information if you're interested.

Re: Bed will not heat

null@example.com (pascal) — Tue, 21 Oct 2014 01:04:41 +0000

I'm a relative newb with both 3D printing and electronics, so I'm confused by your referencing "the" MOSFET. Aren't MOSFET's simply components used to construct transistors, so that there would be gazillions of them within the motherboard? Dumb question, no doubt, but I'm trying to understand everything I can.

Sorry to hear that my problem doesn't help you out with yours--good luck all the same, and thanks for the help!

Re: Bed will not heat

null@example.com (jagowilson) — Tue, 21 Oct 2014 00:39:54 +0000

pascal wrote:

I tried attaching the photo, but for some reason it doesn't show up. I posted a Dropbox link instead. Unfortunately my printer is an SD3 that's over a year old--definitely not under warranty. And what is a mobo? I take it this is a common problem?

Oh okay. Nevermind. Mobo = motherboard, where everything is attached.

Well, you either have the option of soldering or upgrading your board, if the mosfet is in fact what's wrong. Someone else may have more insight than me. No, this is not a common problem, I'm just having troubles of my own with my SD4, but its clearly unrelated

Really burned out though, damn! Some nice brown marks... lol. If you manage to get it off, you could check those pins with a multimeter, but be very very careful- they are extremely close together. I'm reluctant to recommend this though. Wait for the advice of someone else.

Re: Bed will not heat

null@example.com (pascal) — Tue, 21 Oct 2014 00:37:30 +0000

I tried attaching the photo, but for some reason it doesn't show up. I posted a Dropbox link instead. Unfortunately my printer is an SD3 that's over a year old--definitely not under warranty. And what is a mobo? I take it this is a common problem?