Bed Thermal Runaway and ABS
We purchased a i3 MK2S Kit for work about 2-2.5 months ago. I assembled it, with no issues, and it calibrated perfectly. I've made maybe 15-20 parts so far, the first 3/4 of it being PLA, then switching over to ABS, and now I'm getting "Bed Thermal Runaway" stops. The first few ABS parts came out fine. I started a part last night, and received a "Bed Thermal Runaway". I restarted it, and the next part came out well, but this morning, I had it again. I read the previous forum posts, and off-site comments, and I've taken the bed off, inspecting everything; the wiring and thermistor all seem where they belong, with no damage. I opened the control box, and everything seems in place, as well. No melted connectors, cracked wires visible.
I'm using industrial-grade ABS (from one of our customers), so it's not cheap junk, and I'm using ABS juice before the parts. Any ideas? I haven't brought it up to the boss, but he's going to be pretty frustrated if it's not working two months in...
Thanks
Nathan
Re: Bed Thermal Runaway and ABS
I forgot to mention...
- the fan is off, as this is ABS (come to think of it, I don't think it was running for PLA either. Hrmm...)
- this is taking place in a stable environment, 68°F all the time, no breezes.
- using Solidworks 2011 and the provided Slic3r.
Nathan
Re: Bed Thermal Runaway and ABS
With no obvious physical cause, try reloading the firmware in case that has become corrupted. I am also a great believer in 'slow it down and try again' as a general rule when a print goes wrong. Is the part you are failing on smaller or larger than previous successful prints?
Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor
Re: Bed Thermal Runaway and ABS
That's the problem--I've been starting at 25%, so as not to allow dragging of the border across the part space. I've been working with 1.5-2" diameter parts. I just ran 12 - 1" parts, and that went ok, but when I had one of them, as well as a 3" diameter part in the center, it didn't work. Very frustrating. I'll try reflashing the firmware, and see how it goes.
I also have my personal MK3 hopefully on it's way to me this week, and I'll have the two side-by-side at work for a while, and we'll see how it goes. Worst case scenario, I'll have to RMA the board and bed, but I'll have our in-house electrician go over everything first.
Off-subject, I should have used my other forum account for this. Oh well.
Nathan
Re: Bed Thermal Runaway and ABS
Sometimes I have the same problem with ABS. The solution is enclosure. Mine is very simple - IKEA table with cardboard walls. And when the front "door" is open for a long time the Bed temperature starts fo fall. When it reach 94 (must be with 100) the printer shows the error.