9
$\begingroup$

Is hot glue suitable for FDM printing, or some process similar to it?

I think it has all of the required properties, and could produce a flexible transluscent print. It's cheap, hotends are cheap, and the technology has been around for a while.

I couldn't find any examples or anyone talking about such a material for use, on here or the general Internet. I wonder if there are tradeoffs or challenges that make it not worth pursuing.

Improve this question
$\endgroup$
6
  • $\begingroup$ Because here are only answers with the mindset of "don't do it, because it doesn't sound it could work, but nobody knows it for sure.": If you are interested in this, then try to do it. Even a failure and researching the reasons why it cannot work with evidence is something good. $\endgroup$
    – Horitsu
    Commented Jul 24, 2018 at 5:05
  • 1
    $\begingroup$ i've seen these on youtube. the prints aren't great, but they resemble the model... $\endgroup$
    – dandavis
    Commented Jul 26, 2018 at 18:28
  • 1
    $\begingroup$ Have any of these answers answered your question? $\endgroup$
    – Davo
    Commented Jan 15, 2019 at 17:49
  • 1
    $\begingroup$ @Horitsu - I can't see what the problem is... this question has been highly voted and received four (fairly comprehensive) answers. The site is only as good as the community around it. Maybe you should contribute a bit more, if you feel that the site lacks good answers? $\endgroup$
    – Greenonline ♦
    Commented Apr 13 at 14:20
  • $\begingroup$ @Greenonline this was 6 years ago (3d printing was not new anymore but also far away from the knowladge of today), and to the exact time there were way less answers with less value. and yes i just wanted to encourage somebody to do another research branch on this topic. Sorry for encouraging others, i will not do it anymore, ok? $\endgroup$
    – Horitsu
    Commented Sep 19 at 9:00

4 Answers 4

Reset to default
5
$\begingroup$

Yes, we have Hyrel users who print with Hot Melt Adhesive 3796 from 3M (essentially a high performance hot glue) with our Krakatoa series print heads.

Hyrel3D Krakatoa series, KRA print head

These heads don't print with filament; the user fills a metal reservoir with paste, gel, or even powder or granules, loads the reservoir onto the head, loads the head onto the printer, applies heat if necessary (some models up to 250C), and then prints the gcode with positive displacement. The KR2 is like the KRA above, but it is made specifically for higher temperature, higher viscosity materials, with tighter tolerances and multiple gaskets.

I have used this model head to print materials including hot glue, polycaprolactone, porcelain, vasoline, toothpaste, plasticine, and metal clays.

Watch Hyrel3D KR2 and TAM Overview for an overview of this head.

Note: I sell this equipment, and have used it since 2012.

Improve this answer
$\endgroup$
4
  • $\begingroup$ I think it would significantly improve this answer if you describe that the KR2 is a heated precision syringe which is specifically designed to extrude gel rather than rigid filament - and this addresses the first two issues mentioned in one of the other answers (feed precision when using a large cross-section stock, and printable volume per machine load). Presumably the 'hot end' temperature range is also more suited to lower melting points. $\endgroup$
    – Sean Houlihane
    Commented Jul 25, 2018 at 12:06
  • 1
    $\begingroup$ I didn't want to turn this into an advertisement, but I'll elaborate some. Thanks. $\endgroup$
    – Davo
    Commented Jul 26, 2018 at 11:12
  • 1
    $\begingroup$ I read 'toothpaste' and thought 'lol, I mis-read that as toothpaste...' $\endgroup$
    – Sean Houlihane
    Commented Jul 26, 2018 at 12:31
  • $\begingroup$ You wouldn't believe the materials we've tested with... $\endgroup$
    – Davo
    Commented Jul 27, 2018 at 11:45
4
$\begingroup$

You could mount a hot glue gun to a 3D positioning frame, but you would immediately notice the following:

  • Hot glue sticks are fat, so you lose a lot of precision for each feed/retract increment. I.e., it's a lot harder to get precise feeds with a fat stick because the stick size is so much larger than the nozzle.
  • Hot glue sticks are short, so you would to create a filament to spool the stuff or come up with a glue stick feeder.
  • Hot glue melts at 120 °C and common plastics such as nylon melt at much higher temperatures. So hot glue would make an AWFUL structural part like a stepper mount. Even PLA barely deals with stepper temperatures. Note that temperature tolerance is irrelevant for costume parts.
  • Hot glue is soft, which makes it a great glue, but not very stiff for, say, making parts for a 3D printer. However, the parts might be fine for use only in costumes, etc.

But, if you then used your 3D glue printer to dispense glue for gluing stuff together, well...that might be valuable. :D

Improve this answer
$\endgroup$
3
  • $\begingroup$ to 1) there are many geared extruder setups out there. to 2) there are also longer sticks avaiable and glueing together is also an option. to3&4) if the goal is a flexible translucent part, than i think more of costume parts than mechanical parts. (btw. in costume making hot glue is a often used thing) $\endgroup$
    – Horitsu
    Commented Jul 24, 2018 at 5:09
  • $\begingroup$ @Horitsu thanks for comment. Edited answer to support cosplay. $\endgroup$
    – OyaMist
    Commented Jul 24, 2018 at 14:36
  • $\begingroup$ I think you're thinking way too narrowly or literally. Material properties dictate the use of the material. So you wouldn't use hot glue instead of nylon, or to try to print a 3/4" tall miniature. The fact that the material is so big and imprecise would lend itself to bigger, lower resolution, projects. A box to house some electronics for example. Thanks for answering, I'm not roasting your answer to be mean, just pointing out a few errors I noticed. $\endgroup$
    – YetAnotherRandomUser
    Commented Apr 13 at 14:40
2
$\begingroup$

If the user, TheSmasherOr (who suggested the edit) posts their own answer, then this wiki answer can be deleted

From this (rejected) suggested edit:

There have been some new and interesting discoveries by Stefan Hermann on this subject; it seems that Hot Melt EVA Plastic can indeed be turned into a sort of Filament and used inside a 3d printer. This filament has to be oiled after melting as to not stick to itself and everything it touches.

After all of the conditions are met though it can be perfectly good to use in FDM 3D printers to make what you would normally make using one. although it is quite difficult to bridge and make overhangs due to the goopy nature of EVA.

More on this topic can be found in this ~19 minute video by Stefan Hermann of the CNC Kitchen YouTube channel:

Improve this answer
$\endgroup$
4
  • $\begingroup$ I just saw his video about this and wondered what had happened to my question here. TBH, I'm surprised it wasn't immediately eradicated like everything else I ask on the SE sites. $\endgroup$
    – YetAnotherRandomUser
    Commented Apr 13 at 14:14
  • 1
    $\begingroup$ @YetAnotherRandomUser - you've been highly voted for your question and got 4 answers. I don't see what your complaint is. Did any of the solutions actually help you? If so, then maybe consider upvoting and accepting an answer. $\endgroup$
    – Greenonline ♦
    Commented Apr 13 at 14:17
  • $\begingroup$ Well you can't see all the things that were removed, and I haven't been back in a few years because of that. I didn't even know there were answers here, so I'm reading through them now. $\endgroup$
    – YetAnotherRandomUser
    Commented Apr 13 at 14:36
  • $\begingroup$ @YetAnotherRandomUser - no answers have been deleted, nothing has been removed - I can see (as can other high rep users) if there are any deleted comments/answers, and there are none. Nothing nefarious has happened... :-) $\endgroup$
    – Greenonline ♦
    Commented Apr 13 at 14:37
0
$\begingroup$

I think not. Unless you intend to make a very special printer that feeds on glue stick, you must make filament from it. Should be doable.

But my experience with cold hot glue, is that it is not very durable. It's a bit elastic but nothing like elastic filament. It breaks instead. So when you have your filament, I think you will have a bit of trouble handling it, feeding it into the printer etc. If you, for instance, clog the nozzle the slightest, the extruder will tear the filament to shreds very quickly.

Improve this answer
$\endgroup$

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .