What adhesive for sticking parts together ?
I'd like to know what adhesive will work for sticking together parts of different (or the same) materials. Ideally, I'd like a matrix of materials (PETG, PLA, TPU etc) where cells of the matrix show how to glue to corresponding materials together. Does anyone know of such a matrix?
My immediate question is how (if it's possible) to stick TPU to PETG. My use case is a custom-shaped clamping jaw which needs a soft/non-scratching and moderately conforming contact surface - so I'm thinking a PETG structure with TPU contact surface. I don't have multimaterial, so would need to print as separate parts. I'm also considering interlocking geometry as an alternative or in addition to adhesive. The TPU layer would probably include compressible air pockets to make it more conforming.
Thanks!
Re: What adhesive for sticking parts together ?
Sorry I don't know of any such table/reference, but it sounds like an excellent idea.
I asked about/proposed a similar reference for comparing the moisture absorption properties of various filaments here.
That's "MISTER Old Fart" to you!
Re: What adhesive for sticking parts together ?
For PLA to PLA, use crazy glue.
For ABS to ABS, use acetone to solvent weld.
For TPU to PLA, try heat welding (they will fuse, but it won't be as strong as the original extrusion).
For PETG to anything, use screws because nothing sticks to PETG.
To be honest, if you're trying to connect parts from dissimilar materials, screws (or some other mechanical connector) are probably the way to go most of the time. PETG and TPU don't stick well to most of the adhesives you're likely to find around the house.
Re: What adhesive for sticking parts together ?
I found a table. Your question is related to "how do I clean PETG off my printer's nozzle/bed/etc". That is, a lot of glues work by slightly dissolving the plastics at the joint so they flow together a little.
I found a discussion on What Dissolves PETG on another forum ( http://www.soliforum.com/topic/13523/what-dissolves-petg/ , where one participant pointed to a nice (if a bit dense) chart of chemical compatibility/resistance http://sevierlab.vet.cornell.edu/resources/Chemical-Resistance-Chart-Detail.pdf - the entries with "N" in them are possible glues, because the plastic has No resistance to the chemical. That thread also pointed to a chart specifically for PETG: https://solutions-in-plastics.info/nl-be/datasheets/transparante%20kunststoffen/eriks%20-%20petg%20chemical%20resistance.pdf
The upshot of that thread is that nothing you can legally have in your house dissolves PETG. Heat is all you have to work with for that filament.
Have you looked at Friction Welding? It's basically sticking a piece of filament into a drill and running the drill as you press the filament into a joint. I don't know whether it will work for the higher-temperature plastics, but I've seen a lot of videos of people doing it with PLA and such. See for an example.
Re: What adhesive for sticking parts together ?
The upshot of that thread is that nothing you can legally have in your house dissolves PETG. Heat is all you have to work with for that filament.
Laquer thinners stands a chance here in the UK, although there seem to be several recipies. Cellulose thinners is sometimes described as being suitable for thinning laquer, and I have some of that so I'll see what it does. I also have 24% acetic acid in my kitchen which is sold off the shelf in Swedish supermarkets for pickling stuff!
Re: What adhesive for sticking parts together ?
For PETG, I found this (though I had to use the wayback machine to find it).
http://www.scigrip.com/product.php?id=1 4"> https://web.archive.org/web/20160322090622/http://www.scigrip.com/product.php?id=14
3™: Water thin, non-flammable, very fast-setting solvent cement for bonding acrylic. It will also bond with other thermoplastics such as polystyrene, CAB (cellulose acetate butyrate), PETG (polyethylene terephthalate glycol) and polycarbonate to themselves. It will not bond to cross linked acrylics.
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Other solutions can be found with a little digging....
attaching petg parts
That's "MISTER Old Fart" to you!