1 Topic by sandcub1971

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Topic: Print issue I havent had before

I am using an FT-5. Once I had it set up properly I had beautiful prints that worked well. I have been using it since they came out with the FT-5, but as of this week I started having issues. The pictures below will show you what I am trying to explain. I am using the titan extruder, and have tried various temps. But the last 10 prints I did had what I believe to be underextrusion. I switch to 3 different plastics new out of the box to see if it was my plastic. All 3 did the same thing. I felt the extruder stepper motor and its not any hotter than it usually is. I have watched and checked the gear drive to see if its is slipping but does not appear to be. I have had the gear grind into the filament before, but this doesn't present the same issue. No sound indication that its grinding. I cleaned the tip with a .4 tip cleaner and ran 30 inches of filament thru it at 250 degrees to try to help clean out any partial clog. But none of my attempts have shown me a culprit. Maybe some of you have experienced this before and can point me in the correct direction to cure this issue.
Thank you for your time in this matter, if you need more information let me know I can tell you what ever you need.

Don

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2 Reply by carl_m1968

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Re: Print issue I havent had before

Have you confirmed your reported temps and actual temps.? Have run a PID tuning on the hotend? Looks to me like the hotend is loosing heat during long extrusion moves.

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3 Reply by Tin Falcon

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Re: Print issue I havent had before

Pull up your temp logs and see if it drops on your long extrudes.

Tin

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4 Reply by sandcub1971

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Re: Print issue I havent had before

Thank you Carl for the response. I have the same reading from my lcd as I do from simplify3d. I haven't used a temp gun on it today but earlier this week I did and it was within a degree of what the lcd said. So hopefully that rules that out. As far as PID tuning if the PID's were correct before and I haven't changed anything what would cause that to change? I am not disagreeing with what your saying I am just curious what could have changed it? I will keep working on it and post back (when) I figure it out.

5 Reply by sandcub1971

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Re: Print issue I havent had before

Tin Falcon wrote:

Pull up your temp logs and see if it drops on your long extrudes.

Tin

Your talking about the temp logs in the slicer while its printing?  I will try that also. Thanks

6 Reply by Tin Falcon

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Re: Print issue I havent had before

If printing from RH it will log temps  What host program are you using . I do not know if the lcd  will log temps or not.
Also check your themrisitor  make sure it is secure . Sound s like something broke or has come loose  you are just going to have to track it down . would not hurt to run a coupe hundred mm of filament through make sure your numbers are right on your calibration. Could it be your extruder is losing steps/bad driver?  just thinking out loud here.

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
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Marlin/Repetier Host/ Slic3r and Cura

7 Reply by sandcub1971

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Re: Print issue I havent had before

I use simplfy3d. I ran about 30 inches thru it last night but didn't watch the temps while doing it. I am going to do it again and watch it. I thought about the driver but haven't gone to that yet

8 Reply by sandcub1971

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Re: Print issue I havent had before

Here what I found while watching temp log. 200 Degrees and 500mm. Starts at 200 in about 3 seconds jumps to 207 then 204,200,199,200,199,200 it just hovers around 200 for the rest of the test.
Tried at 190 went 193,190,189,190,189,190 basically same thing it hovers around 190 for the full run

9 Reply by sandcub1971

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Re: Print issue I havent had before

Is there a way to tell if its the driver without swapping out the driver?

10 Reply by sandcub1971

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Re: Print issue I havent had before

You guys may be on the correct path. Printing into the air 500-600mm temp stays pretty good. I loaded a file and had it print that and the temps are all over the place. Starts at 190 then starts to fluctuate anywhere from 170 - 195. Maybe the thermistor is losing contact with the heat block when its moving. Which sucks because about 3 months ago the thermistor was replaced as it had a intermittent issue. The big difference is that back then it would stop printing with the error of thermal runaway. Now it just keeps printing, just horribly.

11 Reply by wardjr

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Re: Print issue I havent had before

Sounds more like a bad connection or broken wire on the heat cartridge.  As you said, a thermistor problem would show an error.  My advice would be replace the wires and connectors with new.  Since your there,might just as well put a new heat cartridge on as well.

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12 Reply by Tin Falcon

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Re: Print issue I havent had before

Could be something as simple as loose screw terminals to the heater.

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura

13 Reply by sandcub1971

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Re: Print issue I havent had before

Update; problem fixed.
I am not exactly sure how it could happen, but the problem was the thermistor.  I have print for 8 hours straight and have not experienced the same issue again. I removed the thermistor and installed a PT100 I had and now the problem is gone. So I would have to say the thermistor was reading incorrectly. Reading higher than normal so the heating element would cool down enough to not soften the plastic enough causing it to grind instead of extruding. Funny thing is this sound completely bogus, but I am printing successfully again. So I will assume that was the problem.
Thank you guys for your input, it led me down the correct path to fix it.

Don

14 Reply by yizhou.he

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Re: Print issue I havent had before

I had similar issue before, it is because the thermistor wire protection shell damaged near where the screw fix it to the heat block. If your themistor wire moves while hotend moves, this will happen. themistor not fixed well in the heat block can also cause this problem, but the root of the problem is your thermistor wire moves with the hotend, which is not good, will cause problem sooner or later because two thermistor wire scratch to each other and will break the shell sooner or later. fix the thermistor wire with kapton tape or other heat resistant method so that it will not move or shake with the hotend.

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