heatbed maximum temperature?

[Dmon96]

I am trying to use ABS filament on my Prusa I3 X which comes with the aluminum work surface. I cannot get the temperature to go over 85C, but the manufacturer says to work on a heatbed at 100-110C. I contacted Geeetech for support, but was told this was the normal work temp for ABS. I have checked multiple sites, and they all say 100C or more... I am using ABS slurry painted on but half the time my project breaks free.... Should I insist for support/replacement heatbed heater or am I missing something? The printer is only 2 weeks old, and I have no problems at all printing with PLA.

[Mark]

Hi, it sould be about 100. Does the hotbed has a bad contact or not? could it be shorted out?

[Dmon96]

No, the bed temp goes up quickly for the 55C that I use for PLA, but it gets to about 80 then takes forever for getting to 85 and if I leave it I may get as much as 90 after about 15 minutes. I have checked the contacts and redone the terminal to try and fix it, but no luck. When doing PLA at 55C, the temp is nice and consistent, but if I am doing ABS it is hit or miss whether the job sticks to the bed due to the bed temp.

[Dmon96]

I have ordered a glass bed to replace the aluminum to see if the ABS sticks any better, but I can't really see that it will change the bed heat much....

[Mark]

What's the resistance of the bed? when not plugged it should be about 1.5ohms。
Do you have a fan or airconditioner that may cooling it down ?

[cmore11]

You can try retuning your heatbed with the M303 command and update your firmware. The PID values in the firmware were way off for me initially.

[Mark]

Hi, I test the hotbed in my I3 X today, and find that it takes me half an hour or more to reach 100 degrees! I never noticed that before!
And as you said, after 2 minutes it would reach 70 and struggling to 100. So I think is normal for the printer to get that high.
Cause the bed is so big that dissipated heat quickly. And later I found other printers also the same.As for ABS, the bed temp needn't to be so high, 70-80 will also do.
The only purpose for the bed is to keep your object from bending, and use some glues spray on the bed with 70 , I found it works too.

[liutas4x4]

Mark, it was naked heat bed in your test?
Mine, covered with aluminium plate, supplied from Geeetech in bundle, heats up to 100 about 5-7 minutes, and only once I was waiting for about 15 minutes.

BTW, aluminium provided is not the best solution, - ABS not glued at full range 85-100 C.

[Mark]

yes with the aluminium plate covered is the same results. But I can print ABS using 85-95 degrees with some glues on the bed.

[liutas4x4]

I suppose your heating body is slightly bended and you have a a gap(s) between alu plate and it.
If this is true, you can use some thermopaste, which is used for connecting sinking radiator to CPU in computers - just distribute thin wave of it on a heat bed like ketchup on pizza.
It might help. Not 100%, but if where are the gap, it helps.