On 12/22/2017 1:40 PM, BruceXling wrote: > Could I please ask what glue is best used with PLA and ABS? The advice that I've been given for PLA is a cyanoacrylate (CA) glue, also known as a superglue. This is the stuff that I use:  http://www.bsi-inc.com/hobby/insta_cure_plus.html It appears to be available at Amazon.  I buy it (rebranded) from my local hobby shop.  I use it for model rockets (primarily cardboard and balsa), for PLA, and for general household fixing. BSI seems to recommend the pink MAXI-CURE stuff for plastics; I haven't tried it.  (Buy some solvent too:  http://bsi-inc.com/hobby/un_cure.html ) Wikipedia says that you can weld PLA with dicholoromethane.  An Amazon search shows a plausible glue that lists dichloromethane as an ingredient:   https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY .  It doesn't mention PLA, but does mention bonding PVC, ABS, and several other plastics.  That's a pretty big tube for my kind of work, and the 5-6 minute work time is longer than I'd like - the CA gives me maybe 20 seconds, and that's good.

I bought some tetrahydrofuran because it's supposed to work with PLA, but I don't find it useful. It behaves nothing like ABS does with acetone. As a result I mainly work with ABS.However, I did not try heating the tetrahydrofuran, which might make a difference. Seems a bit scary. Dave Gustavson On Fri, Dec 22, 2017, at 7:27 PM, Jordan Brown wrote: > On 12/22/2017 1:40 PM, BruceXling wrote: >> Could I please ask what glue is best used with PLA and ABS?> > The advice that I've been given for PLA is a cyanoacrylate (CA) glue, > also known as a superglue.> > This is the stuff that I use: > http://www.bsi-inc.com/hobby/insta_cure_plus.html> It appears to be available at Amazon. I buy it (rebranded) from my > local hobby shop. I use it for model rockets (primarily cardboard > and balsa), for PLA, and for general household fixing.> BSI seems to recommend the pink MAXI-CURE stuff for plastics; I > haven't tried it. (Buy some solvent too: > http://bsi-inc.com/hobby/un_cure.html )> > Wikipedia says that you can weld PLA with dicholoromethane. An > Amazon search shows a plausible glue that lists dichloromethane as an > ingredient: > https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY > . It doesn't mention PLA, but does mention bonding PVC, ABS, and > several other plastics. That's a pretty big tube for my kind of > work, and the 5-6 minute work time is longer than I'd like - the CA > gives me maybe 20 seconds, and that's good.> > > _________________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Ethyl acetate is a much less scary solvent for PLA. I haven't tried bonding with it but it does dissolve PLA but perhaps not the pigments and other additives. On 23 December 2017 at 03:46, David Gustavson <dbg@scizzl.com> wrote: > I bought some tetrahydrofuran because it's supposed to work with PLA, but > I don't find it useful. It behaves nothing like ABS does with acetone. As a > result I mainly work with ABS. > However, I did not try heating the tetrahydrofuran, which might make a > difference. Seems a bit scary. > > Dave Gustavson > > > On Fri, Dec 22, 2017, at 7:27 PM, Jordan Brown wrote: > > On 12/22/2017 1:40 PM, BruceXling wrote: > > Could I please ask what glue is best used with PLA and ABS? > > > The advice that I've been given for PLA is a cyanoacrylate (CA) glue, also > known as a superglue. > > This is the stuff that I use: http://www.bsi-inc.com/hobby/ > insta_cure_plus.html > It appears to be available at Amazon. I buy it (rebranded) from my local > hobby shop. I use it for model rockets (primarily cardboard and balsa), > for PLA, and for general household fixing. > BSI seems to recommend the pink MAXI-CURE stuff for plastics; I haven't > tried it. (Buy some solvent too: http://bsi-inc.com/hobby/un_cure.html ) > > Wikipedia says that you can weld PLA with dicholoromethane. An Amazon > search shows a plausible glue that lists dichloromethane as an ingredient: > https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement- > Low-VOC/dp/B003HNFLMY . It doesn't mention PLA, but does mention bonding > PVC, ABS, and several other plastics. That's a pretty big tube for my kind > of work, and the 5-6 minute work time is longer than I'd like - the CA > gives me maybe 20 seconds, and that's good. > > > *_______________________________________________* > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > >

 I bought some tetrahydrofuran because it's supposed to work with
 PLA, but I don't find it useful. It behaves nothing like ABS does
 with acetone. As a result I mainly work with ABS.
 However, I did not try heating the tetrahydrofuran, which might
 make a difference. Seems a bit scary.

 Dave Gustavson


 On Fri, Dec 22, 2017, at 7:27 PM, Jordan Brown wrote:

 On 12/22/2017 1:40 PM, BruceXling wrote:

 Could I please ask what glue is best used with PLA and ABS?

 The advice that I've been given for PLA is a cyanoacrylate (CA)
 glue, also known as a superglue.

 This is the stuff that I use:
 http://www.bsi-inc.com/hobby/insta_cure_plus.html
 <http://www.bsi-inc.com/hobby/insta_cure_plus.html>
 It appears to be available at Amazon.  I buy it (rebranded) from
 my local hobby shop.  I use it for model rockets (primarily
 cardboard and balsa), for PLA, and for general household fixing.
 BSI seems to recommend the pink MAXI-CURE stuff for plastics; I
 haven't tried it.  (Buy some solvent too:
 http://bsi-inc.com/hobby/un_cure.html
 <http://bsi-inc.com/hobby/un_cure.html> )

 Wikipedia says that you can weld PLA with dicholoromethane.  An
 Amazon search shows a plausible glue that lists dichloromethane
 as an ingredient:
 https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY
 <https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY>
 .  It doesn't mention PLA, but does mention bonding PVC, ABS,
 and several other plastics. That's a pretty big tube for my kind
 of work, and the 5-6 minute work time is longer than I'd like -
 the CA gives me maybe 20 seconds, and that's good.

I hope you guys are consulting something like the Merck Index on the safety of this stuff you are playing with.  Or at least managing precautions like fume cabinets etc. Having worked in a university research lab during the cavalier 1970's I was glad afterwards I did _not_ end up with a long career in that line of work.  Too many chemicals, too many unknowns. Rob On 23/12/17 21:36, Mark Schafer wrote: > > carb cleaner also dissolves PLA - and makes it soft and pliable for > quite along time too. Its mainly the Toluene I think. Causes a 20% > increase in volume until it evaporates... > - https://www.thingiverse.com/thing:987604 > > > On 12/23/2017 9:51 PM, nop head wrote: >> Ethyl acetate is a much less scary solvent for PLA. I haven't tried >> bonding with it but it does dissolve PLA but perhaps not the pigments >> and other additives. >> >> On 23 December 2017 at 03:46, David Gustavson <dbg@scizzl.com >> <mailto:dbg@scizzl.com>> wrote: >> >> I bought some tetrahydrofuran because it's supposed to work with >> PLA, but I don't find it useful. It behaves nothing like ABS does >> with acetone. As a result I mainly work with ABS. >> However, I did not try heating the tetrahydrofuran, which might >> make a difference. Seems a bit scary. >> >> Dave Gustavson >> >> >> On Fri, Dec 22, 2017, at 7:27 PM, Jordan Brown wrote: >>> On 12/22/2017 1:40 PM, BruceXling wrote: >>>> Could I please ask what glue is best used with PLA and ABS? >>> >>> The advice that I've been given for PLA is a cyanoacrylate (CA) >>> glue, also known as a superglue. >>> >>> This is the stuff that I use: >>> http://www.bsi-inc.com/hobby/insta_cure_plus.html >>> <http://www.bsi-inc.com/hobby/insta_cure_plus.html> >>> It appears to be available at Amazon.  I buy it (rebranded) from >>> my local hobby shop.  I use it for model rockets (primarily >>> cardboard and balsa), for PLA, and for general household fixing. >>> BSI seems to recommend the pink MAXI-CURE stuff for plastics; I >>> haven't tried it.  (Buy some solvent too: >>> http://bsi-inc.com/hobby/un_cure.html >>> <http://bsi-inc.com/hobby/un_cure.html> ) >>> >>> Wikipedia says that you can weld PLA with dicholoromethane.  An >>> Amazon search shows a plausible glue that lists dichloromethane >>> as an ingredient: >>> https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY >>> <https://www.amazon.com/SCIGRIP-10315-Acrylic-Cement-Low-VOC/dp/B003HNFLMY> >>> .  It doesn't mention PLA, but does mention bonding PVC, ABS, >>> and several other plastics. That's a pretty big tube for my kind >>> of work, and the 5-6 minute work time is longer than I'd like - >>> the CA gives me maybe 20 seconds, and that's good. >>> >>> > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- *Rob Ward* Lake Tyers Beach, 3909 Lake Tyers Beach Website <http://www.laketyersbeach.net.au> Ubuntu Mate - A great OS <https://ubuntu-mate.org/>

On 22/12/17 21:40, BruceXling wrote: > Could I please ask what glue is best used with PLA and ABS? Just get normal Plastic Weld, which is methylene chloride (dichloromethane). It's safer than many of the others mentioned, easy to apply with a brush, gives you a little working time to adjust position, and the joint gets strong very quickly unless you applied too much. https://www.amazon.co.uk/Plastic-Weld-Cement/dp/B0053WXLVU As mentioned by others, acetone works with ABS, but so does Plastic Weld and I find it doesn't cause the "bloom" that acetone can give. I do use cyanoacrylate too but usually if I think I might need to part the pieces later. It tends to give a strong but brittle joint and a sharp tap can often get it apart.