BB 1.1 dual After having fitted new pt100 and got maching up and running..all great.then 10 mins into print THERMAL RUNAWAY, So i restart print and same again....have read about fan wire noise but this was never a problem with my old rumba before it failed...ideas pleaseeee
The fans on the dual are very aggressive. Make sure the print cooling fans are as low as possible. It may also help to run the PID tuning routine again at your nominal print temperature.
once it started it kept happening at the same point every time I retried that print. I disabled the part cooling fan to eliminate that as the issue. Removing and reseating the heater was the last step before replacing it but thankfully it worked. My guess in my case is a bad connection but who knows. Pid tuning can be done from the control panel in simplify3d or octopi (I think, I don't use it) have a look on the Marlin wiki for the exact command. Or if you have RC6 firmware with the option enabled you can do it from the control panel. http://reprap.org/wiki/PID_Tuning
Il go turn it on now and look at available settings..ive heard some FW has auto PID tuning..mine aint
Still going at 11 mins......would me having flow turned up over 150% have any effect? As its ramming cold filament into hot end?
I'm sure you're watching it like a hawk; is your extruder temp oscillating much? Ideally it shouldn't swing by more than a degree either way. If it's constantly swinging by more that might mean your PID settings aren't right.
Had the same. Ended up with PID parameters more agressive (P=40 I=25 ...) and it works like a charm since. THERMAL RUNAWAY is another story: I have a BB dual with thermistors, and thermistors are connected through 2 pin plug. There was a false contact on one of those on the head, as a result measurement was erratic. Solution: contact cleaning bomb, and repeat this each week when you start up the BB. Investigating for finding gold plated contacts. Possible pollution with plastic fumes?