Polycarbonate build plate…. No bed heat Success!!!
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Thats the effect I am seeing right now orkercho, i will let you know when I have a chance to troubleshoot (the filament)
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Okercho,
I just wanted to show you that I am able to reproduce what you are experiencing. But more testing needs to be done before i can draw a conclusion.
This was with a freshly sanded build plate. The part on the left was printed and easily removed just by sliding a scraper underneath. It did not show any signs of cupping. For that print I used a known working roll of PETG it was Taulman Guidl!ne I have also printed Taulman TechG (petg) and Rigidink Petg without issue.
The second one showed warping after flexing the plate… as you can see it was difficult to remove breaking the part in the process. This was with a roll of Taulman Bluprint which is a high temp petg printed at 290
I am not yet ready to blame a bad roll of filament as i need to do more testing (extrusion issues and horrid first few layers) i want to see if different settings will resolve those issues before coming to a conclusion but it is looking like a filament issue.
Its just going to take some time because i will need to keep resanding until i get it right. I will report back when i know more.
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So here are my findings and conclusion. Clear PETG has a tell tale that you do not see in your colored PETG. When clear PETG gets too hot it gets a lot of micro bubbles giving it an opaque white look instead of a translucent appearance.
I remembered this when extruding into air and seeing it come out clear at 5mm/s then i remembered i had lowered all of my jerk and accell settings to match a post that deckingman had made during his testing of pressure advance. I was already slicing at 75mm/s with no reductions in speed for any features accept first layer.
So i raised my accel and jerk settings a lot and increased first layer speed to 80% though 70% is probably better then reprinted with the Taulman Blueprint….
The print popped right off as i tapped it with a scraper.
On the left is the new print, on the right is the failed print from before.... as you can see as the print got to smaller features and slowed down the PETG started breaking down and becoming opaque.
I think it is safe to say you are seeing the same thing, your filament is spending too much time in the hotend or you need to lower your temps if speed is not a factor
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These findings also seem to make a good case for using clear filament to calibrate your printer because they give you a clue when settings are negatively impacting the filament through overheating.
Looks like I have some more tuning to do
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I've read about polycarbonate build plates before and the tenor was, the parts often stick too good. Maybe it's the sanding, that makes all the difference? Would it work with shotblasting too? I guess it depends on the stuff you shoot at it?
Where did you get the POM filament from? ( Why do they offer it, when it is "known" to be unprintable? )
I've made these 2040-sliders from PTFE, but POM would be much better I guess.Motedis sell POM Filament http://www.motedis.com/shop/3D-Filaments/3D-Filament-POM-175mm-05kg-Made-in-Europe::3540.html
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This surface works really well.
ABS printed on 80 C heatbed from https://www.thingiverse.com/thing:1504207
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Is that the PC Bed material?
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Just some of my experiences trying to find cheap and usable filaments, I have no affiliation whatsoever with the companies:
Hobbyking sells PA Nylon, POM and PETG filaments for very reasonable prices (little over 20$/20€ per a kilo roll).
I can't say anything about the POM or PA yet as I don't have a suitable print surface (nor an enclosed printer) but I really like their black and white PETG (solid colors).
It's not spooled so nicely, but the dimensional accuracy seems good and it prints very nicely and the parts are durable so it has replaced ABS for me almost completely. Hope they get more colors as well.I print it on ABS juice on glass with no sticking issues whatsoever (80-90 C bed / 255C hotend). AT this temp it flows really well and the parts come out durable and with very good layer adhesion. At 240C the parts tended to get harder and more brittle.
I have also used PETG from a Czech seller (on Ebay.de) called Filament PM. Very nicely spooled and packaged and the dimensions seem good. To me it seems a tiny bit harder to print than the Hobbyking variety as it seems a bit more viscous so has to be printed a bit slower but they do have more colors. I have not made any strength comparisons but both produce definitely usable parts easily. The layer adhesion is much better than with ABS and no warping to talk about and no smell!
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Hi there!
Long time since my last report here… I've great success with PLA using the PC surface, even with quite big parts. I'm still having little beding as mentioned before even if the part don't warp at all, but is barely noticeable and doesn't happen for all prints, so I'm really happy, so I tried the next step... ABS!
Yesterday I tried to print for the first time with ABS, and I started to test the distance to the bed. I'm using 0'13mm offset for PLA (no warp, stick perfect and no elephant foot), but in order to get the ABS I had to use baby steps and get it 0'2mm closer to the surface, which doesn't make any sense... Anyway, my first print was a failure, as one of the parts stick too much (I couldn't remove it, I will need to use a sharp today and probably resand a bit) and the other warped a lot after 5 layers, so I had to stop the print...
@Whitewolf, what do you recommend as offset for printing successfully ABS? I will continue making tests during the weekend…
BTW, I bought some PETG and ASA from rigid.ink, but I wasn't able to test it yet...
Regards!
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As POM seems to stick on PC, what about making the bed with a POM sheet? Do you think PLA/ABS can stick on it?
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FMA, pretty much nothing sticks to POM in my limited experience. Also POM is pricey and releases nasty gases when it is overheated.
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Ok. It was just a thought…
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Yeah it's good that we keep trying different options though. I have some PC now based on whitewolf's recommendations so hope to try it later this week
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Any suggestion where to get PC in the UK? All my searches turn up the clear stuff but no opaque white.
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Is opaque better?
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I think that it depends on the sensor you're using. If you use an optic one, you can have issues with the transparent one… for a capacitive or a piezoelectric, I don't think there is any difference, and in terms of adhesion, I cannot think in a reason why it should be different.
Regards
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Well, I guess opaque PC have some additional stuff, so they can change a little bit the behaviour…
BTW, clear PC is nice, because you can put leds all arround (if thick enough), which illuminates the printing part!
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Anyone has had success with ABS? I have tried white opaque PC (sanded according to instructions Whitewolf) but it sticks too well.
The print is fused to the bed and no way to get it off without destroying it. Could it be that the Nozzle temp I am using for ABS is too high (250°C) for PC? -
That does seem high to me. I get stellar prints out of ABS at 220°.
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I tried ABS just once @ 245°, and it didn't stick, although I think my offset to the bed is the problem. I hadn't had problems to remove the one I f***ked with a re-sanding of the PC sheet, is like before the ABS test xD.
Regards
