PETG vs. ABS - Which is better? These are my thoughts

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  • RazorAntilles
    Lieutenant, Junior Grade
    • Oct 2024
    • 21

    #1

    PETG vs. ABS - Which is better? These are my thoughts

    Howdy fellow bubble heads!

    I've been working on and off on a pair of 3D-printed LA boats; one in 96th, the other upscaled to 72nd off the plans Bob sells at the Drydocks. However, as I'm monkeying with different things, I've been experimenting with different filaments and settings on my printer to see if I can get parts to be more refined or achieve different qualities, and so on.

    Right now, I'm experimenting with a hull print of the 144th Typhoon in ABS after running out of PETG filament, and my initial results were spotty. I had a couple of print failures due to adhesion issues, but a little googling told me I needed to do a little more prep between each print and clean my build plate when using ABS.

    However, in discovering these notes and nuggets, I've arrived at this conclusion: for the best ease of use and interaction, I think PETG is the overall best filament to use... at least with my particular printer, which is the Flashforge Adventurer 5M Pro. However, that's because I was able to print two LA hulls and assorted parts with almost no problems from start to finish that weren't user error. Am I saying ABS is a lesser material? Absolutely not. PETG has just been easier to work with for me... so far.

    ABS seems to be a more highly-rated plastic, which makes sense because PETG is marketed as a middle-of-the-road option between PLA and ABS. However, I'm new to the material, and these are my initial thoughts. I do intend to print the entire hull in ABS if I can to see how well my printer will handle it as well as whether or not I will learn from any mistakes made in order to refine printer and file settings to achieve the optimal results. I will also note that I am printing this hull at 100% infill.

    But, since I'm still a novice to this hobby, I would like to invite comment: what filament options have you had the most success with? Are you a PETG user exclusively? Do you only print ABS/ASA? Do you find that even PLA is good enough for what you're doing?
  • Marylandradiosailor
    Lieutenant

    • Nov 2021
    • 59

    #2
    Just my experience ... (I am going to keep this very short as I don't have much time tonight) ... but everyone's view is a bit different so take it for what you paid for it.

    PLA - great for tools, tests, gadgets etc., not for subs as it will get soft at much too low a temperature for something used outside

    PETG / PETG+ - my favorite filament BUT you need to dial in your process and still be a little careful in hot summer. I did not have good results in the beginning but did a bunch of testing to dial it in, and most critical filament must be dry, not just a little bag of desiccant, I always dry my filament for an hour or so before each use, constantly during use, and keep sealed between uses.

    ABS - I have used and do use some, difficult warpage on large parts ... but ABS with glass fiber is best however this filament has less layer to layer adhesion. I will be testing the glass fiber version more.

    I am very interested in PETG with glass fiber but I haven't had the time to tinker yet.

    I recommend the youtube channel My Tech Fun (Dr. Igor Gaspar, mechanical engineer) spend a few hours reading his filament testing. I toss him a buck a month for patreon and get his constantly updated test spreadsheets.

    Note all of my recent experience is with a P1S, and I use the P1S with enclosure for all filament types. Good luck.

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    • TuptubBuilder
      Lieutenant Commander

      • Sep 2020
      • 104

      #3
      I just ordered Polymaker Polylite ABS. It's supposed to be less toxic when printing. I've had great success with other Polymaker filaments such as PLA and PETG. I'll report my experience with it.

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      • Subculture
        Admiral

        • Feb 2009
        • 2404

        #4
        If you sand the inside of the hull and line it with some lightweight glass cloth and epoxy resin, it won’t matter much which filament you use. ABS sands much nicer than PLA or PETG. Also there’s ASA filament.

        Comment

        • TuptubBuilder
          Lieutenant Commander

          • Sep 2020
          • 104

          #5
          Has anyone tried HT-PLA? It sounds too good to be true. It prints just like PLA but annealed, it is thermally resistant to 150 C.

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          • RCSubGuy
            Welcome to my underwater realm!

            • Aug 2009
            • 1936

            #6
            I just picked up a couple of spools of ASA - Carbon Filled. I'm hopeful!

            Up to now, I've been printing hulls exclusively in ABS-GF, but I really want to try the ASA and ASA-CF. The ABS tears through build plates, too.
            Last edited by RCSubGuy; 09-19-2025, 11:44 AM.

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            • RazorAntilles
              Lieutenant, Junior Grade
              • Oct 2024
              • 21

              #7
              One thing I'm discovering with ABS that I'm not sure may be unique to me is a little bit of warping on side walls: my suspicion is that I made a rookie mistake by trying to print two hull halves at the same time and the consistent heat has caused the pieces to 'warp' inward a little. The problem doesn't seem to be back-breaking, at least not yet: I figure a little bracing when attaching hull pieces plus a dash of heat treatment should correct the problem if done properly... or reprinting the affected piece(s) individually to see if the shorter time in the printer's heat might reduce warp chance.

              However, I must also note that my Typhoon testing is a new experience for me: I was absolutely spoiled by the LA prints, because the cylindrical hull pieces just worked without issue aside from minor fitment that needed a touch of sanding and filing to correct.

              Comment

              • CC Clarke
                Commander

                • Aug 2020
                • 293

                #8
                Originally posted by RCSubGuy
                I just picked up a couple of spools of ASA - Carbon Filled. I'm hopeful!

                Up to now, I've been printing hulls exclusively in ABS-GF, but I really want to try the ASA and ASA-CF. The ABS tears through build plates, too.
                The carbon fiber filament wears out nozzles faster as well. ASA is excellent for this application.

                Comment

                • RazorAntilles
                  Lieutenant, Junior Grade
                  • Oct 2024
                  • 21

                  #9
                  So, I just about exhausted one roll of Creality ABS filament printing up a 144th Typhoon at 100% infill, and I was not able to complete the entire hull using that one roll. I still have to print sections 7 and 8 (bow) along with the bow plane mounts, the dive planes, and sail top, and I will need to reprint the top rudder support due to a really weird warping issue that manifested during the print process. I also had a bulkhead print fail due to built plate adhesion, which resulted in my first ever true sacrifice to the Flying Spaghetti Monster that inevitably graces all 3D printers at one time or another.

                  Based on this experience, and the printer I'm using (again, the Flashforge Adventurer 5M Pro) I think I'm going to confine my submarine printing to PETG. That filament ran just fine for my two LA hulls, but the advantage of the 96th LA from the Drydocks is the hull sections are fully circular segments as opposed to half-circle, which seems to go a tremendously long way towards eliminating the problem of warping or other strange occurrences. The 144th Typhoon might have printed better overall had I stuck with PETG from the get-go, but considering how the hull segments are laid out, I'm not entirely convinced there still wouldn't have been some sort of something happening. I'm also not going to sit here and say I did everything right from the jump, because I'm still fairly new to the game overall, so please take my notes with a grain of salt. If you're using Bambu or other properly 'high end' printers, there's a solid chance you might be getting far and away superior results with ABS than I did through my more 'middle of the road' printer.

                  Comment

                  • TuptubBuilder
                    Lieutenant Commander

                    • Sep 2020
                    • 104

                    #10
                    HT-PLA Click image for larger version

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ID:	190611 FYI: https://www.youtube.com/watch?v=bnjVVY0om48&t=70s

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                    • Marylandradiosailor
                      Lieutenant

                      • Nov 2021
                      • 59

                      #11
                      Polymaker HT-PLA vs HT-PLA-GF: High-Temperature PLA Tested!

                      Temperature testing near end of video. Interesting.

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