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Acetone welding PLA
#1
I keep seeing talk on various forums that some brands of PLA will both smooth and weld using acetone. I know there are solvents such as Weldon 16? that can weld PLA, but I have heard they are quite nasty.

PLA plastic is impervious to acetone, but supposedly some blends of PLA have enough other things in there that the trick works, like it does with ABS.

I thought I would give some acetone a try with my 3D Fillies PLA+ prints. AND.. nothing at all happened. The acetone seemed to have no effect on my printed parts, and there was not even the slightest bit of sticking happening between them.

Please report if you have ever had success with this method, and with which brands?
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#2
Personally, have have had very little success with any of the glues suggested for PLA.

I have taken to welding the PLA parts together.
See this thread on the subject.
https://www.3dprinteddroids.net/thread-311.html

I have seen growing reports stating the method has worked for them. :-)
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#3
(12-08-2018, 06:51 AM)Martyman Wrote: I keep seeing talk on various forums that some brands of PLA will both smooth and weld using acetone. I know there are solvents such as Weldon 16? that can weld PLA, but I have heard they are quite nasty.

PLA plastic is impervious to acetone, but supposedly some blends of PLA have enough other things in there that the trick works, like it does with ABS.

I thought I would give some acetone a try with my 3D Fillies PLA+ prints. AND.. nothing at all happened. The acetone seemed to have no effect on my printed parts, and there was not even the slightest bit of sticking happening between them.

Please report if you have ever had success with this method, and with which brands?

I did an experiment on different glues in one of my videos (Ill link upon request) and found that the following adhesives worked well for me depending on the situation

Poundland Cheap Superglue (About £1 from poundland)
Very runny and will go everywhere. SLightly slower drying than Gorilla but sticks flat surfaces very well

Gorilla Glue (About £3 a bottle)
very quick drying but is a gel.

UHU (About £1 from Poundland)
Very good at sticking where extra support is given. I wouldnt trust it where strength is needed, but for example, the dome pieces can be glued with UHU and then bolted. Takes ages to ry (I allow 24 hours) but once dry is rather strong

3D Pen (About £25 from Amazon)
What could be better at sticking plastic than actually melting the plastic and welding it together? Pretty much pays for itself as you can use scrap cuttings of filament but does normally require clean up afterwards.
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#4
By all means, Link the video, that way we can all learn :-)
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#5
I have been using the HobbyKing thick (or Medium?) CA glue and their accelerator. I haven't broken a joint yet and I have been treating my droid pretty hard.

I will keep my fingers crossed.
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#6
This is my video that I try out different glues



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#7
Hmmm, the video appears to be unavailable.. :-(
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#8
(12-08-2018, 06:51 AM)Martyman Wrote: I keep seeing talk on various forums that some brands of PLA will both smooth and weld using acetone. I know there are solvents such as Weldon 16? that can weld PLA, but I have heard they are quite nasty.

PLA plastic is impervious to acetone, but supposedly some blends of PLA have enough other things in there that the trick works, like it does with ABS.

I thought I would give some acetone a try with my 3D Fillies PLA+ prints. AND.. nothing at all happened. The acetone seemed to have no effect on my printed parts, and there was not even the slightest bit of sticking happening between them.

Please report if you have ever had success with this method, and with which brands?

I have been printing R2D2 parts in PLA for a few months now.  I did a lot of research as to how I could assemble the pieces.  I finally found a glue that actually melts (welds) the PLA and so far it's holding very well.  I will attach some pictures of the product. It's the Weld-on 16 or Sci Grip 16.  I found that the tubes with syrupy cement work best, the cans with the liquid are ok, but it's difficult to keep the joint wet and tight while it welds it.  The tubes remind me of the plastic model cement I used as a kid, building model cars.
The way I use it is I cover the edge of one side so it's as full of glue as I can get without it running off. Then press the two pieces together and hold it for about 30 seconds.  Once it's bonded for a while I cover the inside seams with another bead of the glue and even it out across the seam.  After a day, it's pretty much cured and the large bead of glue inside has shrunk down across the seam (you can see it in my pictures where I welded the R2D2 skirt together).

Here are some links on eBay and Amazon for the glue:

Ebay Sci Grip 16

Amazon Sci Grip 16

Do your own shopping the prices vary a lot.  Should be able to buy a tube for around $10 US.


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