3D Printing Today #591

[3D Printing Tips and Tricks]

News: 

Max 95000

https://3dprintingindustry.com/news/nike-takes-the-next-step-with-new-air-max-95000-245697/

Segments: 

Flexible PEI sheet on the N2, Glues, Auctioned Industrial machines

https://www.amazon.com/dp/B0DLP5T2QX?ref=ppx_yo2ov_dt_b_fed_asin_title

Thing of the Week: 

Just In Case

https://www.thingiverse.com/thing:7167248

threedprintingtoday.libsyn.com or 

Search for 3D Printing Today wherever you get your podcasts

No show net week!

Happy Thanksgiving!

[Ed Street]

I want to, uhm, clarify some points mentioned in the podcast.  When CA was mentioned, some things were said that I felt were misleading.  First, CA does not need oxygen to set; it does not need to 'dry'; it does polymerize.  Also, not all CA are equal; there are many types of CA with varying additives, which makes your results vary, and, like most things, there is a right tool for the right job.

First, fumes.  Not all CAs produce fumes that irritate the eyes and other mucous membranes.  Some are odorless and medical-grade, used to glue skin together.  I recommend that anyone using CA switch to odorless.   The CA I use is very flexible, odorless, low-heat, and styrofoam-safe.  When we are giving pen demos, classes, and the like, I will put CA on my hand and spray it with the accelerator we use to show it will NOT burn your skin; that is the type we use.

CA glue is held in a liquid state suspension by a relatively weak acid. When the pH shifts to neutral, it initiates the polymerization chain reaction.  With the presence of alkaline products, such as BAKING SODA, and specific accelerators, such as ACETONE, the shift will be harsher, making the CA brittle, fragile, and weaker.  Other products work better than acetone, and that product is used because it's plentiful, cheap, and easy to get.  The better products are Naphtha, heptane. Etc.

'Flexible' CA is a game-changer, hands down.  ‘Flexible’ additives like PMMA (poly methyl methacrylate) reduce the brittle point and are often found in products that need a lightweight, shatter-resistant, impact force like Plexiglas, Lucite, Acrylite, and Perspex.  Other brands, such as Super-Gold by BSI, are used.  Flexible glue allows a flexible joint, meaning both sides can bend if needed, and the joint will still hold. 

.

I have been making pens, knives, firearms, etc., for well over 20 years, and in pen making, we use a CA finish, which holds up super well and creates a perfect 3D effect from a 2D material.  I have used many additives with CA, such as linseed oil, walnut oil, various other seed oils, rubber, and the like, plus I have tested several dozen brands, types, and additives with CA.  For 3D prints, I use BSI Super-gold+ as the flexible glue.  So far, it bonds easily to PLA, ASA, and ABS, which are the bulk of filament types I use.  I have not tested it with PCTG or PETG.  

Any CA marked with a +, 'medium', or 'thick'  contains plexiglass. This gives it a gap-filling property.  The odorless CA on a 3D print: I get a good 30-40 seconds of working time, and I do use an accelerator to set the CA.

So, CA is a very diverse glue; it is definitely not a one-size-fits-all, nor is it that if you use one, you have used a thousand.  

[Bryan Eckert]

Neat Ed. Thanks for some insight.

I tend to just use the stuff I find at hobby lobby and prefer the thick stuff. It’s worked fabulous. For the lightsaber handles I make, spread it on, set the parts together and twist back and forth for a second, and it sets up and I can’t budge it. 

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