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    First time PETG, dudes

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    • tecnoundefined
      tecno @peirof
      last edited by

      @peirof

      Dry your PETG !!! It is hydrophobic

      peirofundefined deckingmanundefined 2 Replies Last reply Reply Quote 1
      • peirofundefined
        peirof @tecno
        last edited by

        @tecno

        that makes sense, it's been out of the sealed bag for a long time ...

        Thx

        1 Reply Last reply Reply Quote 0
        • deckingmanundefined
          deckingman @tecno
          last edited by

          @tecno said in First time PETG, dudes:

          @peirof

          Dry your PETG !!! It is hydrophobic

          PETG is afraid of water ??? 😧 I think you mean hygroscopic. πŸ™‚

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

          achrnundefined tecnoundefined 2 Replies Last reply Reply Quote 4
          • achrnundefined
            achrn @deckingman
            last edited by

            @deckingman said in First time PETG, dudes:

            @tecno said in First time PETG, dudes:

            @peirof

            Dry your PETG !!! It is hydrophobic

            PETG is afraid of water ??? 😧 I think you mean hygroscopic. πŸ™‚

            Hydrophobic can also mean repelling water. PETG is generally reckoned to be a hydrophobic material (compared to some) which means actually that it tends not to absorb water - it's the hydrophilic (or hygroscopic, which PETG is not) ones that you really need to manage.

            However, it will eventually still absorb some, and drying filament never hurts...

            I find PETG maks the cracking noise if I extrude hot and fast into open air - not printing. Even filament relatively recently taken from a vaccum-sealed pack does it a bit in those circumstances. Does it do it when printing, or only when testing extrusion? I'd contemplate turning down the heat a little (but that's a variable that depends upon the particulars of the material).

            deckingmanundefined 1 Reply Last reply Reply Quote 0
            • Aussiephilundefined
              Aussiephil @peirof
              last edited by

              @peirof

              The little micro explosions are most likely as some have said absorbed moisture that is boiling off.... most sites will tell you that PETG absorbs moisture quite well so if it's an older roll then it's likely to have a level of moisture.

              As for temperature, you really need to test this for yourself on your printer, grab a temperature tower and print it out with varying temps.

              I for example print transparent PETG @214c only going up to 220c max when i want it a little more fluid.
              So at 214c i can extrude at 12mm cubed flow rate using a 0.6 nozzle, 0.4 layer, 0.8 width at 38mm/s, rock solid layer adhesion, no strings. If i have small holes <6mm then speed gets dropped to 32mm/s. I do run a high flow dragon hotend and can print faster but these setting provide good output, no blobs and at worst very fine hairs.

              Cheers
              Phil

              Cheers
              Phil

              1 Reply Last reply Reply Quote 0
              • mrehorstdmdundefined
                mrehorstdmd
                last edited by

                I find that if the PETG sits in the hot-end too long (i.e. printing slowly) it tends to bubble. I have taken advantage of that for some prints by switching print speed to alternate between 50 mm/sec and 15 mm/sec resulting in a horizontally striped print. The higher speed parts of the print are clear and the low speed parts are "frosted".

                I'm not sure what's boiling off, but I see identical behavior in freshly opened spools and spools that have been sitting around for months, so it doesn't seem to be absorbing water from the air.

                https://drmrehorst.blogspot.com/

                deckingmanundefined 1 Reply Last reply Reply Quote 1
                • deckingmanundefined
                  deckingman @achrn
                  last edited by

                  @achrn said in First time PETG, dudes:

                  @deckingman said in First time PETG, dudes:

                  @tecno said in First time PETG, dudes:

                  @peirof

                  Dry your PETG !!! It is hydrophobic

                  PETG is afraid of water ??? 😧 I think you mean hygroscopic. πŸ™‚

                  Hydrophobic can also mean repelling water. PETG is generally reckoned to be a hydrophobic material (compared to some) which means actually that it tends not to absorb water - it's the hydrophilic (or hygroscopic, which PETG is not) ones that you really need to manage.

                  However, it will eventually still absorb some, and drying filament never hurts...

                  Those two statements are contradictory. The first one is incorrect. PET-G filament is definitely hygroscopic. Take a look at this article.

                  https://www.matterhackers.com/news/how-to-succeed-when-printing-with-petg-filament

                  If you scroll down far enough you will come across this statement (quote):

                  "Many filaments can absorb water from the air and PETG is one of the most notorious. Because PETG is hygroscopic, you need to dry your spool before using it,......."

                  Ian
                  https://somei3deas.wordpress.com/
                  https://www.youtube.com/@deckingman

                  1 Reply Last reply Reply Quote 1
                  • deckingmanundefined
                    deckingman @mrehorstdmd
                    last edited by

                    @mrehorstdmd said in First time PETG, dudes:

                    I'm not sure what's boiling off, but I see identical behavior in freshly opened spools and spools that have been sitting around for months, so it doesn't seem to be absorbing water from the air.

                    I'm not a betting man, but I'll wager that it's definitely boiling off water. One of the worse reels of filament I ever had was reel of E-Sun PET-G which was fresh out of it's vacuum foil packaging. I event wrote a post about it on my blog. I eventually gave it it to someone else who spent many days drying it and eventually managed to get some sort of print but it was never great. We concluded that the reel must have fallen into a river before it was retrieved and vacuum packed. πŸ™‚

                    Ian
                    https://somei3deas.wordpress.com/
                    https://www.youtube.com/@deckingman

                    mrehorstdmdundefined zaptaundefined 2 Replies Last reply Reply Quote 1
                    • mrehorstdmdundefined
                      mrehorstdmd @deckingman
                      last edited by

                      @deckingman I get shiny, glass-like, transparent prints out of both fresh and long-ago-opened PETG filament as long as I keep print speed above about 25mm/sec. I live in a humid place (in the summer) and it doesn't seem to affect the prints at all. Maybe the filament is already saturated with water. I buy cheap, no-name stuff via amazon.com, and 5 lb spools from Keene Village Plastics, a quality filament maker. I have noticed no difference in the behavior/performance, but maybe the manufacturing processes are similar enough that the spools all arrive with about the same amount of water absorbed into or adsorbed onto them.

                      I don't have a filament dryer but I do generally keep filament in sealed boxes with CaCl desiccant. If I'm in the middle of a design and printing test parts I usually just leave the spool on the printer, exposed to the air in the room, often with the window open, sometimes for days at a time. Again, no apparent difference in performance.

                      I am usually running the filament through a volcano heater block with a 1mm nozzle, so maybe that is a contributing factor.

                      https://drmrehorst.blogspot.com/

                      peirofundefined 1 Reply Last reply Reply Quote 0
                      • peirofundefined
                        peirof @mrehorstdmd
                        last edited by

                        Thanks,

                        In the area where I live, Valencia (Spain), on the coast, there is a lot of humidity, it is easy for us to be over 70% ...

                        It is difficult to keep the filament rolls with low humidity ...

                        What effects does this humidity have? (on the impression and on the finished piece).

                        • Only aesthetics?
                          -Is it more difficult to print?
                        • the backfires when printed?
                        deckingmanundefined 1 Reply Last reply Reply Quote 0
                        • deckingmanundefined
                          deckingman @peirof
                          last edited by

                          @peirof said in First time PETG, dudes:

                          Thanks,

                          In the area where I live, Valencia (Spain), on the coast, there is a lot of humidity, it is easy for us to be over 70% ...

                          It is difficult to keep the filament rolls with low humidity ...

                          What effects does this humidity have? (on the impression and on the finished piece).

                          • Only aesthetics?
                            -Is it more difficult to print?
                          • the backfires when printed?

                          I'll post that link one more time. It has all the information you need and will answer all your questions. https://www.matterhackers.com/news/how-to-succeed-when-printing-with-petg-filament

                          Ian
                          https://somei3deas.wordpress.com/
                          https://www.youtube.com/@deckingman

                          peirofundefined 1 Reply Last reply Reply Quote 0
                          • peirofundefined
                            peirof @deckingman
                            last edited by

                            @deckingman great article, thx

                            1 Reply Last reply Reply Quote 0
                            • tecnoundefined
                              tecno @deckingman
                              last edited by

                              @deckingman said in First time PETG, dudes:

                              @tecno said in First time PETG, dudes:

                              @peirof

                              Dry your PETG !!! It is hydrophobic

                              PETG is afraid of water ??? 😧 I think you mean hygroscopic. πŸ™‚

                              Hmmmm marking words you are πŸ˜‰ I'm just a bloody foreigner making some mistakes.!

                              deckingmanundefined 1 Reply Last reply Reply Quote 0
                              • zaptaundefined
                                zapta @deckingman
                                last edited by zapta

                                @deckingman said in First time PETG, dudes:

                                We concluded that the reel must have fallen into a river before it was retrieved and vacuum packed

                                Apparently some filaments go through water during the manufacturing process.

                                https://youtu.be/cI2u-C09JoQ?t=62

                                1 Reply Last reply Reply Quote 0
                                • deckingmanundefined
                                  deckingman @tecno
                                  last edited by

                                  @tecno said in First time PETG, dudes:

                                  @deckingman said in First time PETG, dudes:

                                  Hmmmm marking words you are πŸ˜‰ I'm just a bloody foreigner making some mistakes.!

                                  You seem to be upset. In which case I apologise. I've been trying to learn a foreign language myself for many years. Personally I'm quite appreciative when a native of that language points out mistakes that I have made. Especially when it is done in a polite way and with a πŸ™‚ . Fear not, I will not try to help again in the future.

                                  Ian
                                  https://somei3deas.wordpress.com/
                                  https://www.youtube.com/@deckingman

                                  tecnoundefined 1 Reply Last reply Reply Quote 0
                                  • tecnoundefined
                                    tecno @deckingman
                                    last edited by

                                    @deckingman

                                    Me upset NO WAY πŸ˜‰

                                    I appreciate all help as do all others Ian, so just forget my answer that was written with a glimpse in the eye.

                                    Looking forward to be corrected LOL

                                    deckingmanundefined 1 Reply Last reply Reply Quote 0
                                    • deckingmanundefined
                                      deckingman @tecno
                                      last edited by

                                      @tecno That's OK then. Electronic communications, whether that be forum posts, emails, social media messages, and with or without emojis, can easily be misinterpreted without the subtly nuances of facial expressions.

                                      Ian
                                      https://somei3deas.wordpress.com/
                                      https://www.youtube.com/@deckingman

                                      tecnoundefined 1 Reply Last reply Reply Quote 1
                                      • tecnoundefined
                                        tecno @deckingman
                                        last edited by

                                        @deckingman

                                        I agree, this old fart (a Finn in Sweden) I am a bloody foreigner everywhere L O L

                                        peirofundefined 1 Reply Last reply Reply Quote 0
                                        • peirofundefined
                                          peirof @tecno
                                          last edited by

                                          What is the humidity that is recommended for the filament? Right now there is 70%.Β Β And I don't know what value is adapting, or which one I should look for...

                                          Anyway it seems to me a lot, although the filament does not have that level of humidity, it will have enough...

                                          I would like to know what is the maximum humidity and the recommended for printing. What solutions do you use to control humidity? I've seen several:

                                          • bake at low temperature, about 60

                                          • airtight plastic containers

                                          • I solved prepared for roll (on Amazon there are many) some recommended

                                          • others (moving to the Atacama Desert,....)

                                          deckingmanundefined 1 Reply Last reply Reply Quote 0
                                          • deckingmanundefined
                                            deckingman @peirof
                                            last edited by

                                            @peirof I built an enclosure for my printer which is largely airtight. All my filament is stored in that same booth. I use cheap dehumidifiers of the type which use Calcium Chloride. Looking at the amount of water produced, I'd say they do a reasonably good job. I plan to install circulating fans at some point, which should improve the efficiency. I have an ESP based temperature and humidy sensor in the garage where the printer booth is situated as part of my growing home automation system, and also plan to fit another inside that booth. Then I'll be able to measure the humidity inside the booth and see if an electric dehumidifier would be worth the expense.

                                            Ian
                                            https://somei3deas.wordpress.com/
                                            https://www.youtube.com/@deckingman

                                            1 Reply Last reply Reply Quote 0
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