heated bed cabled melted  

Re: heated bed cabled melted

Generally this can happen if the plug is not properly inserted or works loose due to poor cable management.

The best solution if you have a soldering iron is to simply solder the wires directly onto the contacts on the underside of the RAMBo.

Once either plug or socket is melted, neither should be used; replacing them is very tricky (especially desoldering the socket from the RAMBo) so the only real alternatives are soldering (as above) or to replace the RAMBo and the plug.

Peter

Re: heated bed cabled melted

thanks for that suggestion.... I am going to be contacting customer support and see if they have any spare parts on hand.

Re: heated bed cabled melted

Did you follow all instructions carefully on how to manage the cables?

(i.e. ziptieing the heatbed cable to the box before it goes in , etc ,etc)

Generally this happens when the plug works its way a little lose, thus creating resistance and heat.

Re: heated bed cabled melted

Followed the instructions exactly and made sure every connection was fully seated in the correct ports.

http://imgur.com/eM3AAPX
I did ziptie the cables bundles as mention in the instructions, as seen in this picture.

Re: heated bed cabled melted

OK, so your cable ties are a tad loose; you should be pulling the cable bundles upwards so it keeps the upper bundle away from the bed while printing and the lower bundle away from possible snagging.

In my earlier post, I did say that this generally occurs when certain conditions are met; it can also happen if a bit of dust gets into the connector.

It happened to me also (on the Mk1) after about 6 months of printing; about a month after I had to replace the cables which broke with a stress fracture.

There may well be other causes; that's the problem with purely mechanical joints which have to pass a high current. The better option is to by-pass those joints and solder directly - which PR used to do with pre-built later MK1 printers.

Peter

Re: heated bed cabled melted

A heads up, this just happened to me as well. I fully expect Prusa to cover this under warranty, I followed all assembly instructions to the letter, zip ties were tight, nylon filament for wire guides were in place. Worked perfectly for almost 2 months then it melted the connection

http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/heated-bed-connector-burned-crispy-o--t2414.html

If the correct thing to do is to solder to the board then Prusa Research should instruct that in the manual, as it stands now I followed their instructions, which caused a malfunction resulting in unuseable equipment... I expect this to be covered and we'll see what Prusa actually does ( reached out a couple weeks ago and never heard a word back from them )

Re: heated bed cabled melted

Peter (PJR's) reply about soldering connections under the board would invalidate any warranty or legal claims. I suggest hold back for a solution directly from Prusa Research and not a Prusa evangelist who advised me there were no problems with the MK1 and bed leveling system. Just before the MK2 launched with auto bed leveling and other major changes, that addressed my initial issues with my MK1 bought two weeks before the MK2 launch. He knew about upcoming launch and mods. So take care with Peters, (PJR's) comments. Or any PRO posts, they were promoted by Prusa Research, not peers here.