Re: Ebay SINTRON Kossel Mini full kit April 06, 2016 11:43AM |
Registered: 8 years ago Posts: 255 |
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DRTak
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hacker
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DRTak
Yeah. just changing material.
But on another note. I am having major issues printing in PLA. For me PETG is easier to print with. It seems that I cant get enough heated filament out of the nozzle. Doesnt make sense.
Oddly, this is a new nozzle and is exactly 0.4mm. My older hotend I mistakenly bore out too much and it was like a 1mm hole. Of course with that nozzle I was able to run my extruder at full speed. Now with my new hotend I am stuck figuring out new settings.
Interesting. In my experience PETG is slower to print than PLA… It is easier to print without adequate object cooling, though.
Yes for PETG it is slower than PLA. But with my new nozzle so far. I have to print PLA at the same speed as PETG. And even then it is too fast?
Re: Ebay SINTRON Kossel Mini full kit April 07, 2016 06:51AM |
Registered: 8 years ago Posts: 5,232 |
Re: Ebay SINTRON Kossel Mini full kit April 07, 2016 06:55AM |
Registered: 8 years ago Posts: 255 |
Re: Ebay SINTRON Kossel Mini full kit April 07, 2016 10:18AM |
Registered: 8 years ago Posts: 319 |
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hacker
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DRTak
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hacker
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DRTak
Yeah. just changing material.
But on another note. I am having major issues printing in PLA. For me PETG is easier to print with. It seems that I cant get enough heated filament out of the nozzle. Doesnt make sense.
Oddly, this is a new nozzle and is exactly 0.4mm. My older hotend I mistakenly bore out too much and it was like a 1mm hole. Of course with that nozzle I was able to run my extruder at full speed. Now with my new hotend I am stuck figuring out new settings.
Interesting. In my experience PETG is slower to print than PLA… It is easier to print without adequate object cooling, though.
Yes for PETG it is slower than PLA. But with my new nozzle so far. I have to print PLA at the same speed as PETG. And even then it is too fast?
This is weird. What is the speed/nozzle d/layer height and temp?
Re: Ebay SINTRON Kossel Mini full kit April 08, 2016 04:48AM |
Registered: 8 years ago Posts: 5,232 |
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hacker
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o_lampe
Warping parts made of ABS is related rather to a bigger expansion coefficient than melting temp differences ( compared to PETG.)
Yeah, thought of that too. Are you dead sure or do you hypothesize?
Re: Ebay SINTRON Kossel Mini full kit April 08, 2016 04:51AM |
Registered: 8 years ago Posts: 255 |
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o_lampe
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hacker
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o_lampe
Warping parts made of ABS is related rather to a bigger expansion coefficient than melting temp differences ( compared to PETG.)
Yeah, thought of that too. Are you dead sure or do you hypothesize?
It's a known fact that ABS has a high expansion coefficient. That's why we put ( heated ) enclosures around the printer to keep the temp difference as low as possible.
The rest is wild guessing...
Re: Ebay SINTRON Kossel Mini full kit April 08, 2016 09:45PM |
Registered: 8 years ago Posts: 319 |
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hacker
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o_lampe
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hacker
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o_lampe
Warping parts made of ABS is related rather to a bigger expansion coefficient than melting temp differences ( compared to PETG.)
Yeah, thought of that too. Are you dead sure or do you hypothesize?
It's a known fact that ABS has a high expansion coefficient. That's why we put ( heated ) enclosures around the printer to keep the temp difference as low as possible.
The rest is wild guessing...
Yes, I meant the exact thing with effector warping. The guess makes perfect sense to me, I just thought maybe you know for sure it applies. Anyway, I think I shouldn't print cooling duct in ABS
Re: Ebay SINTRON Kossel Mini full kit April 09, 2016 08:50AM |
Registered: 8 years ago Posts: 255 |
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DRTak
Well either way, the plain fact in my usage is that ABS warps from heat creep of the heatsink. PETG does not. I assume at a higher temp. Maybe beyond 260 deg C that PETG would start to warp.
Re: Ebay SINTRON Kossel Mini full kit April 09, 2016 02:43PM |
Registered: 8 years ago Posts: 319 |
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hacker
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DRTak
Well either way, the plain fact in my usage is that ABS warps from heat creep of the heatsink. PETG does not. I assume at a higher temp. Maybe beyond 260 deg C that PETG would start to warp.
This plain fact is what I was aiming at, because I was under impression that printed effector is no good, not ABS effector. You didn't really say that. Now I have some picture…
I understand the difference between ABS and PETG is not just temperature, but that while PETG just softens at some temps, ABS warps. I'm fine with my PLA effector so far, but I think I should print a spare
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 05:39AM |
Registered: 8 years ago Posts: 104 |
You are saying about melting(soften) points. But I can't agree that it's correlates with warping. At least I can say about PLA. I'm using cooling duct mounted on effector to cool objects during the printing. The end of it is almost touching heater block (2mm away I can say). And there is no a single sign of warping despite on the fact that I often print with cooler fan off. And it's in black, so it should absorb heat very well. I even thought that it must be melted in seconds if its cooling fan is off, but it's still ok for more than 4 months.Quote
DRTak
I would say PLA < ABS < PETG < NYLON < Metal effector would be my guess as to the least likely to warp.
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 06:03AM |
Registered: 8 years ago Posts: 255 |
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GrAndAG
You are saying about melting(soften) points. But I can't agree that it's correlates with warping. At least I can say about PLA. I'm using cooling duct mounted on effector to cool objects during the printing. The end of it is almost touching heater block (2mm away I can say). And there is no a single sign of warping despite on the fact that I often print with cooler fan off. And it's in black, so it should absorb heat very well. I even thought that it must be melted in seconds if its cooling fan is off, but it's still ok for more than 4 months.Quote
DRTak
I would say PLA < ABS < PETG < NYLON < Metal effector would be my guess as to the least likely to warp.
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 11:37AM |
Registered: 8 years ago Posts: 319 |
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 11:42AM |
Registered: 8 years ago Posts: 255 |
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DRTak
With PETG and PLA my spools are contained in dessicant. However, I didnt use dessicant when I first started and PLA was very brittle before and after a print. PETG I heard is worse than PLA with water absorption but I again am not taking any chances and store my PETG in a vat of dessicant.
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 01:06PM |
Registered: 8 years ago Posts: 319 |
Ive been hoarding dessicant from food products. They have them in protein shake jugs, candy, etc. I put like 10-20 packs of those in an "air" tight tupper ware bowl and toss in the spool of PLA/ PETG. I doubt the tupperware or ziploc container is really air tight. But it does the trick. I have noticed that some of the dessicant pellets turning yellow. So moisture is being absorbed.Quote
hacker
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DRTak
With PETG and PLA my spools are contained in dessicant. However, I didnt use dessicant when I first started and PLA was very brittle before and after a print. PETG I heard is worse than PLA with water absorption but I again am not taking any chances and store my PETG in a vat of dessicant.
I'm trying to store my stuff with dessicant, but I'm not good at being very consistent in these practices. I rarely had any issues with PLA (though I did have a problems with one spool that became totally unusable, perhaps due to absorbed water) and I have never properly stored PETG at all… Haven't had any problems with it yet, but maybe the thing is that I haven't heard it's worse than PLA
Re: Ebay SINTRON Kossel Mini full kit April 10, 2016 02:49PM |
Registered: 8 years ago Posts: 255 |
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DRTak
Ive been hoarding dessicant from food products. They have them in protein shake jugs, candy, etc. I put like 10-20 packs of those in an "air" tight tupper ware bowl and toss in the spool of PLA/ PETG. I doubt the tupperware or ziploc container is really air tight. But it does the trick. I have noticed that some of the dessicant pellets turning yellow. So moisture is being absorbed.
Re: Ebay SINTRON Kossel Mini full kit April 11, 2016 09:44AM |
Registered: 8 years ago Posts: 319 |
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hacker
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DRTak
Ive been hoarding dessicant from food products. They have them in protein shake jugs, candy, etc. I put like 10-20 packs of those in an "air" tight tupper ware bowl and toss in the spool of PLA/ PETG. I doubt the tupperware or ziploc container is really air tight. But it does the trick. I have noticed that some of the dessicant pellets turning yellow. So moisture is being absorbed.
Okay, I'm worse than I thought. When I think I'm doing well I'm using ziploc bags
(that was regarding your doubts, the bigger problem is that I don't always put them in bags).
Re: Ebay SINTRON Kossel Mini full kit April 11, 2016 09:49AM |
Registered: 8 years ago Posts: 255 |
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DRTak
Thats the funny thing. Who would print something and then break it? Well my kids do. They test the printed toys to the limit. The PLA that has too much moisture breaks very easily (with some force). The PLA with dessicant is a little tougher. So I can tell if the PLA was sitting too long outside of the container.
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 09:35AM |
Registered: 8 years ago Posts: 319 |
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 09:52AM |
Registered: 8 years ago Posts: 255 |
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DRTak
Need help. I was printing a large file. 6hrs long. It printed fine in PLA. But now when I go to print anything it prints like below? The bottom is perfect so to speak. But I would say 30min into any print, the top part gets choppy like the picture and see through? I dont understand. I can only assume the nozzle is clogged or partially clogged. But I checked the flow and it looks great. I am at a complete loss.
HELP!!!!
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 10:24AM |
Registered: 8 years ago Posts: 916 |
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 10:27AM |
Registered: 8 years ago Posts: 255 |
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nebbian
I agree with Hacker, it looks to me like your extruder driver is heating up too much, and not driving the way it should. Are you cooling the driver boards with a fan? Have you checked the driver currents with a multimeter? Have you put your finger on the extruder motor after half an hour and felt how hot it is?
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 12:04PM |
Registered: 8 years ago Posts: 319 |
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 04:03PM |
Registered: 8 years ago Posts: 255 |
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DRTak
I dont understand how it can be my extruder motor. I have not had this problem before. It only occured after I finished printing the 5 to 6hr print. After that all of my other prints with PLA have looked like that picture. If I do the print for say 3hrs. It will have bands. Starts off good. Then under extrusion. The good. Then finishes with under extrusion.
How do I check the current in config?
I will start a print again and check the temp of the extruder motor after an hour and see.
I have a fan on a on/off switch blowing air over the duet board. The fan is directly on the motor drivers of the duet. I tested with it on and off and get the same results.
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 05:23PM |
Registered: 8 years ago Posts: 319 |
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 05:28PM |
Registered: 8 years ago Posts: 255 |
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DRTak
Checked the config file and the x y and z motors come up as 1000mA. I do not see any reading for the E motor?
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 06:36PM |
Registered: 10 years ago Posts: 14,672 |
Re: Ebay SINTRON Kossel Mini full kit April 25, 2016 07:10PM |
Registered: 8 years ago Posts: 319 |
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dc42
All the currents default to zero in RepRapFirmware, so you must be setting the extruder current somewhere. Typically you would have a line in config.g something like M906 X1000 Y1000 X1000 E1000.
If you run M906 with no parameters, it will report what the currents are set to.
Can you see or hear the extruder motor skipping steps when the problem occurs?
Re: Ebay SINTRON Kossel Mini full kit April 26, 2016 02:38AM |
Registered: 10 years ago Posts: 14,672 |
Re: Ebay SINTRON Kossel Mini full kit April 26, 2016 10:00AM |
Registered: 8 years ago Posts: 319 |
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dc42
You have the extruder current set to just 500mA, which is very low especially as you have an un-geared extruder. It's the E500 parameter in the M906 command. Try increasing it to E1000 or E1200. What is the specification of your extruder stepper motor?
Re: Ebay SINTRON Kossel Mini full kit April 26, 2016 10:17AM |
Registered: 8 years ago Posts: 255 |
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DRTak
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dc42
You have the extruder current set to just 500mA, which is very low especially as you have an un-geared extruder. It's the E500 parameter in the M906 command. Try increasing it to E1000 or E1200. What is the specification of your extruder stepper motor?
I do not know what the extruder is. Sintron claims its a MK8. But then on their ebay ad, they say its a modified NEMA 17.
[www.ebay.com]
I assume its a NEMA 17? There are no stickers or engravings on it. I took it off the Kossel. I cant tell who makes it etc. I can only go by what Sintron listed on ebay.
I will increase the E to 1000 as you stated.