ABS and Bed Thermal Runway
Good evening,
I have had my printer for about 3 months now, and finally started printing some pieces with ABS. I am using a Black ABS from Hatchbox, I found that a HE temp of 240c and bed temp of 100c would work for most cases.
However the piece below (IMG_1921) was lifting on the corners. So I increased the bed temp and got a great print. The total print time was about 10hrs and I kept the bed temp at 110c for the entire print.
Next I printed the following piece (img_1920) It was all messed up, and tipped over at one point. It is supposed to be a threaded rod, but didn't come out like that. I printed it at the same temp HE 240c and Bed at 110c
Here is where my problems have started. I adjusted my speed setting in slic3r to slow it down, but I left the temps the same. The bed will heat up the 110c and print for about 10 minutes. During that time the temp drops to 100 and I get a Bed Thermal Runaway error. I also tried printing my 20mm calibration cube with the same settings. And I get the same results. The bed temp slowly drops and I get the bed thermal runaway error.
However, if I back the bed temp down to 100c. The bed them maintains 100c and the print completes just fine. That is what is confusing me. Why does it work with a bed temp of 100c but not 110c?
I am very new to 3D printing, and I am still learning... btw For my Hatchbox ABS Slic3r settings, I copied the Prusa ABS settings and modified the temps.
Thanks in advance
John
Re: ABS and Bed Thermal Runway
Have you upped the voltage from the PSU to 12V to 12.5V?
The default setting seems to be around 11.5V, and that is marginal to keep the hotbed at >100C.
Search the forum for "PSU potentiometer" or "thermal runaway"
Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss. If you solve your problem, please post the solution…
Re: ABS and Bed Thermal Runway
Thank you for the reply.
That fixed the issue. The PSU was 12.14V, and I increased to 12.5V and reprinted my calibration cube at 240c/110c and it maintained 110c for 50 minutes
I didn't noticed that it cycled up and down as much as 3 degrees, between 107 - 110 throughout the print.
I plan to add an enclosure, but I needed ABS to print out the parts. Hopefully the enclosure will help maintain temp.
Thanks again.
John
Re: ABS and Bed Thermal Runway
Thank you for the reply.
That fixed the issue. The PSU was 12.14V, and I increased to 12.5V and reprinted my calibration cube at 240c/110c and it maintained 110c for 50 minutes
I didn't noticed that it cycled up and down as much as 3 degrees, between 107 - 110 throughout the print.
I plan to add an enclosure, but I needed ABS to print out the parts. Hopefully the enclosure will help maintain temp.
Thanks again.
John
Doing a PID calibration will reduce those fluctuations. Some people don't advise it, but it has worked very well for me.
(There are two PID calibrations in the .12 version of the firmware. One for the bed, one for the extruder.)
Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss. If you solve your problem, please post the solution…