Starting over with config.g
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I did have this kind of experience with weak PETG some time ago, as far as i could deduce it was cause by a slight mix with another type of plastic (PLA i think) normally the PETG parts i print are really strong but this one part came out so weak i could bend it slightly and at the bend every single layer line would delaminate, could almost pull out the extrustion thread like unraveling a sweater.
The top of the part was nice and strong as i think by that time the PLA was all cleared out, some hotends keep more plastic then others in the nozzle, even just a tiny amount might cause you issues. Something to keep a eye out for perhaps if you get this again after a filament change.
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Thanks, Kezat.
Actually the first troubles occurred after a firmware crash. I was well into a fairly fresh roll when it happened.
And I have always changed out the nozzle and heatbreak when changing to a different type of filament.
I only print PLA or PETG and as you suggest, I learned its good practice to start with a fresh nozzle.
And I even changed the nozzle/throat when this first happened as I thought that the bad adhesion was coming from a clogged nozzle.That's not to say I haven't thought it being the filament. But I experienced the same problems with a brand new roll of PLA.
Admittedly the PLA didn't fail like the PETG did, but I did get a little separation. Upping the temp seemed to eliminate it.Danal,
I am not married so I get to keep my printer inside my climate controlled home.
The temp doesn't vary much. -
Have you considered a PT100 temp sensor upgrade?
Or to verify the temp of the hotend get a multimeter with a thermocouple probe. I've found that the shiny surface and small area of the hotend makes it very difficult to get accurate readings with an IR laser probe.
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Have you considered a PT100 temp sensor upgrade?
You're referring to the E3d temp sensor for the heat block, correct?
I have that already. -
Now we're getting somewhere. It would be unusual to have such a weird temperature discrepancy with a PT100.
In your config at the top of the thread it doesn't look like you have the PT100 setup. Do you now have a it properly bound to the right channel on the daughter board?
Are you using a 2 wire or 4 wire harness?
What temperature does it read right after turning the printer on? It should be dead close to room temp.
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Phaedrux, I just committed a huge faux pa with David in another thread concerning the correct terminology on 3D printer parts.
I called a simple Mosfet an SSR. I know better now.With that, I have told you that I have a PT100 sensor installed on my hotend.
For the sake that I might have given you bad information as well, I am going on the fact that the E3D site calls the little cylindrical cartridge I have installed on mine, a PT100 sensor.
I purchased it as part of a "Sock and Block Upgrade" on Amazon.
Other places that advertise it are calling it just a thermistor cartridge.
I see other upgrades for this such as an amplifier, which I do not have.Just to make sure I haven't mistakenly called something else what it really isn't, here is a picture and it's description that I found on the E3D site, but as mentioned everywhere else calls it a thermistor…
It has 2 wires, both of which are the same color, and I have them installed on the 'E0 VSSA Thermistor1' pins on my board.
The temp reading seems to correct at 22c.
It's identical to the bed's reading as well.If I truly do have a PT100 sensor, and you stated my config settings are wrong for such a thing, that has to be the problem.
Or if it isn't a PT100 sensor, maybe I have no business meddling with electronic devices and I should look into botany as a hobby. -
PT100 sensors are great, but require a small amplifier board to function properly.
See here: https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors
I'm not 100% sure how well it would function as a regular thermistor. From what I can gather it looks like it could be possible if you set the tables for it correctly but it won't be very accurate at higher temps. At room temp it may only be 1c off, but at 200+ it could be more than 30c off. Maybe someone else can chime in about that.
Best bet would be to switch back to your old thermistor for the time being and obtain the amplifier board found here: https://www.duet3d.com/DuetAddons/PT100_DaughterBoard or from Filastruder in the USA: https://www.filastruder.com/collections/electronics/products/temperature-sensor-boards-for-duet
In the config file, to use a PT100 sensor you have to tell it which amplifier channel to look for it on.
From my config:
M305 P1 X200 ; Remap P1 to PT100 channel 200 (Hotend)The amplifier board has up to 2 channels to use (200, 201), and you can stack another amplifier on top of it to get 2 more channels (202, 203). Depending on how the PT100 sensor is wired, (either 2 wire or 4 wire), you can use up both channels to gain higher accuracy. Using 4 wires with twisted pairs allows it to reject more electrical noise and give a more accurate reading. David has posted some more information about that here: https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/
In my case I'm using 4 wires, so I'm using up 2 channels, but you only need to tell it to look on the first channel since there are physical jumpers on the amplifier board that dictate if you're using 2 wire or 4 wire.
I suggest reading the wiki page above on the PT100 and then ordering the amplifier board.
Don't get discouraged. If 3D printing was easy, everyone would do it. What fun would it be if they just worked all the time? Doesn't sound like a fun hobby to me. Gimme something complicated that breaks and I'll be happy. Swearing sometimes, but happy.
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The E3D thermistor cartridges and PT100 sensors look the same, except that I think the wire colours are different. If you have a multimeter, measure its resistance. A PT100 measures about 100 ohms at room temperature, a thermistor measures about 100kohms.
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Phaedrux, I wanted to drop by and update you on my little problem…
I am almost positive that I don't have a temp problem.
It was my extruder feeder.
I hadn't realized it but my filament has been slipping causing the adhesion problems.
Upping the temp only helped it to not slip so much making me think the sensor was not right.I had always thought that the extruder feeder would always pop when it slipped but not in my case.
It would pop at higher speeds, but at slow rates it would just slip.
I found this on Thingiverse and opted to give it a shot before I bought a new feeder.https://www.thingiverse.com/thing:2289203
It is a double drive with a 3:1 ratio and it is the bees knees. I discovered that I need Pressure Advance enabled to tame this thing because it was a mess on the first print after I installed it on my printer.
I can see Pressure Advance doing its thing now and when I make a change in the config file, as before I never really noticed much difference. It helps amazingly well, and I am shocked out how much better my prints are with it now, than they were before. And I was pretty proud of what I was producing then!I haven't gotten all of the bugs out yet, because I think my retraction settings are conflicting with PA just a little….I think.
The reason why I am thinking that is now I am seeing some new behavior with PA enabled.
For example, pausing for a second or two during the print, especially at slower speeds/smaller prints.
I don't know if it is normal or if I indeed have something out of whack but it doesn't seem to make an impact on the print.
I have Pressure Advance set at .2
I tried higher and lower values and .2 seems like the sweet spot.I plan on researching it more on the forum and the wiki.
I just wanted to let you know how things were going and another big thank you for yours, and David's help.
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Hey that's awesome you got it sorted out.
That extruder looks pretty cool. Like a diy bondtech.
With pressure advance you can usually dial back the retraction a little bit. It has also been said that your extruder jerk value should be at least 600. Higher acceleration and top speed as well just so you're not getting pauses.
Cheers
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Thanks so much!
I will lower it now!!
