V2 hot end problems...

[stevewm]

Back a few months ago when I first got my V2 I added 2 additional layer fans. I have always been able to run these at 100% while printing with zero issues with the hot-end having no trouble staying at set temp. Even with the fans at 100%, the hot end has always averaged about 70% output (according to the temp graph in Repetier) to maintain the set temp.

However in the past few days, the hot end has suddenly started having issues achieving and maintaining temperature if the layer fans are turned up any higher than 40% or so. I have checked the wiring, all seems fine. Re-ran a PID autotune, the values it came up with this time where very different than the first time around, however even that has not made a difference. Soon as the fans go on, the temp drops out and the output power goes to 100% trying to get back up to temp, and never quite doing so. If the layer fans are at 50%, it can barely manage 185C

Could this mean one of the heating resistors has possibly failed?

[geneb]

It's entirely possible.

g.

[stevewm]

I have a 40 watt heater cartridge I had ordered when I first got the printer... post office lost it for a few weeks, so I just went ahead and assembled the hotend stock. Looks like I'll be switching to that then

[netdefilr]

I too am having issues with holding a temperature. I took my hotend apart and there appears to be soldering issues with the wiring to the resistors. Looking more into it tonight.

[geneb]

Well using solder on the resistors is probably the root cause of the problem. Crimps were specified for a reason you know.

g.

[netdefilr]

Gene,

There's a wire detached. Those crimps were used. Ran out of time after I took it all apart so I have to figure it out when theres time