You would rather have:
Uncategorized
1
Posts
1
Posters
0
Views
-
You would rather have:
-
undefined evan@cosocial.ca shared this topic
Feed RSS
Gli ultimi otto messaggi ricevuti dalla Federazione
-
@wendinoakland would you call that lip balm?
-
You would rather have:
-
La nuova guerra europea alla privacy Chat Control violerà i diritti fondamentali
In teoria, Chat Control avrebbe dovuto essere sepolto il mese scorso. Il minaccioso piano dell'UE di scansionare in massa i messaggi privati dei cittadini ha incontrato una schiacciante resistenza pubblica in Germania, con il governo del paese che si è rifiutato di approvarlo. Ma Bruxelles raramente si tira indietro solo perché i cittadini lo chiedono. E così, fedele alla sua forma, una versione rielaborata del testo è già in fase di elaborazione, questa volta nascosta, a porte chiuse.
-
On the Benefits of Filling 3D Prints With Spray Foam
Closed-cell self-expanding foam (spray foam) is an amazing material that sees common use in construction. But one application that we hadn’t heard of before was using it to fill the internal voids of 3D printed objects. As argued by [Alex] in a half-baked-research YouTube video, this foam could be very helpful with making sure that printed boats keep floating and water stays out of sensitive electronic bits.
It’s pretty common knowledge by now that 3D printed objects from FDM printers aren’t really watertight. Due to the way that these printers work, there’s plenty of opportunity for small gaps and voids between layers to permit moisture to seep through. This is where the use of this self-expanding foam comes into play, as it’s guaranteed to be watertight. In addition, [Alex] also tests how this affects the strength of the print and using its insulating properties.
The test prints are designed with the requisite port through which the spray foam is injected as well as pressure relief holes. After a 24 hour curing period the excess foam is trimmed. Early testing showed that in order for the foam to cure well inside the part, it needed to be first flushed with water to provide the moisture necessary for the chemical reaction. It’s also essential to have sufficient pressure relief holes, especially for the larger parts, as the expanding foam can cause structural failure.
As for the results, in terms of waterproofing there was some water absorption, likely in the PETG part. But after 28 hours of submerging none of the sample cubes filled up with water. The samples did not get any stronger tensile-wise, but the compression test showed a 25 – 70% increase in resistance to buckling, which is quite significant.
Finally, after tossing some ice cubes into a plain FDM printed box and one filled with foam, it took less than six hours for the ice to melt, compared to the spray foam insulated box which took just under eight hours.
This seems to suggest that adding some of this self-expanding foam to your 3D printed part makes a lot of sense if you want to keep water out, add more compressive strength, or would like to add thermal insulation beyond what FDM infill patterns can provide.
-
@francina1909 @Pierrette @luca aneddoto: era figlio dell'attrice che interpretava Della Street in Perry Mason
-
@francina1909 70- Spazio 1999 80-Quincy 90-Buffy the vampire slayer
-
Landscape
Watercolor painting
#art #mastoArt #watercolor #landscape #trees #forest
-
Current* conditions near Highland Park, IL:
