SoliForum - 3D Printing Community — Large Print Problems

Re: Large Print Problems

2016-07-11T04:28:17Z

Post a picture of your thermistor wires right at the heat block along with any connections. Maybe we can spot something.
You can always use Saran Wrap to build a quick temporary enclosure and some triangle pieces of cardboard for a lid.

Re: Large Print Problems

2016-07-11T04:04:39Z

SpaceCowboy850 wrote:

Okay - I think the thermosistor might have a short, I moved that around and have had stable temperatures for about 3 hours. I'm now just fighting standard uneven cooling causing lifting on the corners and I know some of the solutions to that (make an enclosure), I just haven't done it.
If the thermosistor continues to give me problems, what should I do? Right now it seems fine, but it's unclear when it might act up again.

Make sure it's wires still have the teflon sleeves in place all the way to it's body. If the wires or exposed and can touch each other or touch the sides of the hotends mount hole then it could be causing a short and causing your erratic readings. Also check all connections between the thermistor body all the way back to the board for a bad or loose connection. You can always replace it as well as they are very inexpensive. I am sure printit can hook you up..

Re: Large Print Problems

2016-07-11T03:03:07Z

Okay - I think the thermosistor might have a short, I moved that around and have had stable temperatures for about 3 hours. I'm now just fighting standard uneven cooling causing lifting on the corners and I know some of the solutions to that (make an enclosure), I just haven't done it.

If the thermosistor continues to give me problems, what should I do? Right now it seems fine, but it's unclear when it might act up again.

Re: Large Print Problems

2016-07-11T00:28:47Z

That's what I was just thinking. I'll do a PID, but right now, I moved the thermosisters a little and I'm getting more consistent results...

Re: Large Print Problems

2016-07-11T00:08:03Z

Start the auto tune once the heater is up to temp. This looks more like a loose/bad connection.

Re: Large Print Problems

2016-07-10T23:07:30Z

Just tried to do a PID, and it failed, with "Autotune failed! Temperature too high"

I've blurred out the point before the autotune started.

Re: Large Print Problems

2016-07-10T22:46:58Z

Did you do a PID tuning for the E3D and heatbed? This is not normal

Re: Large Print Problems

2016-07-10T22:38:58Z

Well, I am trying to do a test print, but was having trouble with the bed sticking in one corner. I'd love a bed that heated more evenly. Anyways, I've updated to the latest Repetier-Host, and found my temperature graphs to be a bit chaotic on the extruder. Not good, I think...

Note - it was trying to hit a temperature of 230.

Re: Large Print Problems

2016-07-10T03:41:58Z

Yes, I updated my firmware with the proper thermosister type. Ward helped me dial in my settings, though we never did get the VREF calibrated. I got the ceramic screwdrivers for the job, but when I looked before, I didn't see any post on how to calibrate VREF, so I haven't done anything with that yet.

I'm printing in ABS plastic.

No fan is blowing on the bed, if that's what you mean.

I'll start a print and get pictures tomorrow.

Re: Large Print Problems

2016-07-08T20:53:18Z

AZERATE wrote:

Also, do you have a fan blowing on your board?

Re: Large Print Problems

2016-07-07T21:17:04Z

Did you update the firmware to the new temp limits and thermistor type?
Also, do you have a fan blowing on your board? And what type PSU are you using?

I've had this happen before, but pics, video, or a little more info would go a long way.

+1 to the VREF. You can either order a ceramic flathead screwdriver, or you can fold some Kapton over a tiny flathead found in eyeglass repair kits. But before you start adjusting, try giving some pics as it may or may not be as relevant as other underlying issues.

Re: Large Print Problems

2016-07-07T21:08:06Z

Are you printing with ABS or PLA?

Re: Large Print Problems

2016-07-07T14:38:16Z

I don't believe the filament is stripping. I saw that in the old extruder. The nozzle might be to close to the bed, but it seems fine for most prints. I'm not sure about the VREF. Never adjusted those settings.

I'll get pictures sometime this weekend.

Re: Large Print Problems

2016-07-06T01:00:45Z

Post some photos so we can see what's going on.

-Kevin

Re: Large Print Problems

2016-07-05T18:28:16Z

If your problem is during the first layer then your nozzle is too close to the bed. It could also be not enough tension on the filament tension arm or even VREF for that drive being slightly low. Of course if the filament is stripping on the drive gear a Hobb Goblin will help fix that.