Preheat error when heating bed to 100c
Hi,
Whenever i try to preheat for ABS I get a preheat error when the bed reaches about 96C
When I help the bed a bit with a hot airgun it reaches a 100C and i can print without problems.
The printer is a standard MK2S, the only modification a e3d silicon sock on the print head.
Lower bed temperatures give no problem (90C and lower).
I have checked the voltages on PSU and the bed:
PSU without any heating : 12.88 V
PSU with during preheating: 12.30 V
Bed input voltage 11.80 V
Ambient temperature around 18C
Printer MK2S kit
Firmware 3.0.10
Is this normal behaviour or do i have a problem somewhere and if so is there a solution for my problem besides using a heat gun.
Re: Preheat error when heating bed to 100c
I have a two week old kit with the same issue. If I add a blanket of paper towels on the bed while heating it reached 100 degrees and then will start to print, but cools off after a few layers.
Do you need it to be in an enclosure? Would adding insulation under the bed help? I saw some people adding cork sheets or Ceramic Fiber Insulation Blanket.
Any suggestions?
(FYI - I did check the themister and it is in the foil and taped in place.)
Re: Preheat error when heating bed to 100c
There's a new firmware at https://github.com/prusa3d/Prusa-Firmware/releases that fixed this problem for me.
Re: Preheat error when heating bed to 100c
Also,
Make sure you are not running the cooling fan.
Andrew
Re: Preheat error when heating bed to 100c
Also,
Make sure you are not running the cooling fan.
Andrew
Do you mean the part cooling fan, right? Hot end needs to be cooled I assume.
Re: Preheat error when heating bed to 100c
This may be late, but I have been running my mk2 for a year and recently I have noticed it taking longer to get upto the higher temp i.e. 95 to 105.
Please check the heat bed plug on your rambo as mine has melted and made a mess.
I think the movement loosens the screws securing the heat bed wire into the plug causing high resistance.
What I have done now is to use a separate misfit relay to take the load away from the mini rambo. These are only £15 uk.
I also have a migbot i3 clone which got me hooked and made me buy an original Prusa I3. I could never heat the bed hot enough to print abs until I fitted an external mosfet taking the load away from my electronics. Highly recommend this to save your own Prusa I3`s
Re: Preheat error when heating bed to 100c
This may be late, but I have been running my mk2 for a year and recently I have noticed it taking longer to get upto the higher temp i.e. 95 to 105.
Please check the heat bed plug on your rambo as mine has melted and made a mess.
I think the movement loosens the screws securing the heat bed wire into the plug causing high resistance.
What I have done now is to use a separate misfit relay to take the load away from the mini rambo. These are only £15 uk.
I also have a migbot i3 clone which got me hooked and made me buy an original Prusa I3. I could never heat the bed hot enough to print abs until I fitted an external mosfet taking the load away from my electronics. Highly recommend this to save your own Prusa I3`s
I checked all the cables and they where all seated om and conectors looked good.
I am wondering if this is a psu problem, since the voltage drop seems fairly significant.
I might try a preheat of a lab supply or atx psu just to see if that works