3 ms·
PETG isn’t that great tends to deform less and shatter more, ASA is better if you need temperature resistance and is only slightly more expensive than PETG thes
by dogma1138 6y ago
PETG isn’t that great tends to deform less and shatter more, ASA is better if you need temperature resistance and is only slightly more expensive than PETG these days and it’s also much more machineable.
PLA these days also has quite decent temperature resistance in filaments that were designed for that, but even the most generic stuff should be ok for most electronic applications there shouldn’t be a spot that goes over 45c her alone 60-70 where you really begin to see issue.
- ehnto 6y agoFor a portable device like this I would be worried about leaving it in the car if it's PLA. You can easily see 70c inside a car on a hot sunny day. That said, you can heat treat standard PLA to make it resistant to temperature.
- dogma1138 6y agoI wouldn’t leave a raspberry pi in a car that gets to 70c due to a very likely risk of damaging the BGA SoC and other soldered components.
- jrockway 6y agoThe SoC doesn't thermal throttle until 85C. It is not going to desolder from being inside a hot car.
- Damogran6 6y agoDoesn't PLA get dimensionally unstable with heat treating?
- ehnto 6y agoIt usually is yeah, but you can sometimes get good results. I think it depends a lot on the heat level against the specific print you are doing.
- StavrosK 6y agoPETG shatters more? Are you guys using colored PETG? Pure (transparent) PETG will buckle before it shatters, and is much stronger than PLA for me.
- tonyarkles 6y agoEven coloured PETG has been amazingly shatter resistant for me? I took a bad print and stuck it in a bench vice. It was long and skinny (maybe 3-4mm thick before the print failed), and it literally bent itself in half and did not snap.
- StavrosK 6y agoIt depends, pigment changes its properties. White Spektrum PETG tended to shatter a bit too easily for me (though still not more easily than PLA, I think).
- tonyarkles 6y agoHuh! Good to know! This was D3D in green. The only thing that's managed to break it so far is a drone clipping the ground with its landing gear at 40km/h, and the 3D printed piece was the perfect "weak link" to prevent a more catastrophic failure :)
- StavrosK 6y agoOh yes, engineering intentional weak links is an art of its own, when you don't want the more expensive components to break.
- tonyarkles 6y agoThe joke in engineering school was: "You may choose to design a specific weak link into your design; if you do not do so, one will be provided for you."