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  • Oozing silicone socks

    I experience the silicone sock to ooze out hard, clearish drops onto the print bed from time to time.
    When I removed the sock today, it was britle and hardened with cracks and a molten part.
    Happened with an original micro swiss silicone sock.

    Has anyone else experienced this and has eventually a fix against it?

  • #2
    Are you certain you don't have filament oozing out of the joint between the heater block and the tube that joins the heater block to the heat sink above?

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    • #3
      Click image for larger version

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      No filament leak, it comes from the silicone sock itself.
      It is a quite clear substance that hardens to a glass like substance.
      The sock itself has lost substance
      I am thinking about replacing the sock with some aerogel sheet.

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      • #4
        That is a silicone sock for sure?? How hot is the hotend? I have to think it's a defective sock. Silicone rubber isn't supposed to melt until it reaches 1400C.

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        • #5
          Originally posted by Ender5r View Post
          That is a silicone sock for sure?? How hot is the hotend? I have to think it's a defective sock. Silicone rubber isn't supposed to melt until it reaches 1400C.
          Agreed, there is something else going on. Leaking plastic or maybe bad kapton tape (Edit: I've seen some cheap stuff from China that was like asbestos with a yellowish clear plastic tape on the outside).

          Cheers
          Last edited by Alan; 09-28-2021, 09:21 PM.

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          • #6
            It is a genuine micro swiss sock and I printed only PLA, mostly at 190°C, max. 220C.
            Took some time until I realised it came from the silicone sock.
            Maybe it was a monday piece, I'll try it first with a new sock.

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            • #7
              Originally posted by Alan View Post

              Agreed, there is something else going on. Leaking plastic or maybe bad kapton tape (Edit: I've seen some cheap stuff from China that was like asbestos with a yellowish clear plastic tape on the outside).

              Cheers
              I was thinking about that, too.
              I replaced the temp sensor the other day and the kapton was ok, I replaced it with a piece of 3M high temp silicone tape.

              There are different types of silicone (mixtures). As the blue color.
              Last edited by Erik; 09-29-2021, 12:25 AM.

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              • #8
                Well, I guess I will find out about Micro Swiss blue socks very soon, since I just installed a Micro Swiss direct drive extruder on my Ender 5.

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                • #9
                  Originally posted by Erik View Post
                  Maybe it was a monday piece, I'll try it first with a new sock.
                  Hopefully this is it. You could print using the hotend without a sock (after a PID tune) as a visual check for problems. Regardless, Micro Swiss makes quality hotends. Let us know the solution!

                  Cheers

                  P.S. -- I see you replaced the thermistor before the problem. Any chance the thermal paste used could be part of the problem?!

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                  • #10
                    While silicone socks are good as an insulator and protector for the heat block, I believe they are considered a wear item by the manufacturers that use them. There are many online listings for 3d printing silicone socks on amazon, ebay, and even walmart. I think the repeated heating and cooling of the sock causes them to eventually deteriorate such as shown by Erik.

                    This reminds me of the old saying "nothing lasts forever".

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                    • #11
                      How long should they last? Any advantages to WAHHING 10PCS 2mm thick Heater block cotton Safe Working Temp less 300°C For 3D printer Hotend https://amazon.com/gp/product/B01LAY...?ie=UTF8&psc=1

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                      • #12
                        Originally posted by MambaRoja View Post
                        How long should they last?
                        That's a good question and why I find the OP's issue is puzzling. Outside of accidents, I cannot imagine needing to ever replace one. But, because they are so inexpensive, I keep a few spares on hand. I think any thickness can work provided there is clearance for it (especially between the sock and the print bed). My spares are OEM equivalents so I don't need to PID tune if I'm in a hurry, fwiw.

                        Cheers
                        Last edited by Alan; 09-29-2021, 04:15 PM. Reason: Typo

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                        • #13
                          In a year and a half, I have not had to replace any of mine.

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