do you want natural rock or is synthetic also ok? also do they need to be resistant to freezing water as well? its not clear if there will be any kind of roof above…
very conservative answer would be something like granite, diorite or similar dense rock.
if you have protection from water you can also use more porous rocks like sandstone.
hydrofluoric acid
Not sure if serious but just in case: why would there be any HF in a lithium ion battery?
Are the parts both made of PLA? Silicone caulking would be elastic and easy to break but it might also become unstuck on its own since the adhesion to plastics is not great.
Rubber cement would also work in principle but it might not be reversible at all and depending on the solvent and what plastics you used it might damage the plastic parts while the solvent is drying. Acetone can damage ABS plastics for instance.
Would a low-temp hot melt gun work? They can operate as low as 120°C which might be low enough to not destroy the plastic parts.
It makes a lot more sense once you consider where you are starting from: a rock hurtling around the sun at breakneck speed (29.8 km/s). You can not really bullseye something when you are going almost 30 km per second sideways to it.
https://learn.sparkfun.com/tutorials/logic-levels/all
If i read your question correctly then you are wondering if the voltages you see are going to work for TTL devices. As you can see in the linked tutorial it is not just about nominal Vcc levels. Every chip is different. :)
If the fans are running at full blast, maybe you accidentally disconnected a temperature sensor?
Actually using AI gibberish for this might be the best strategy of all, since Reddit seems hell bent on making money with AI training and feeding AI generated text into AI training has been shown to yield increasingly worse results over time. So you make the product Reddit is selling less attractive.
marble is less resistant to heat but might work if it’s not directly in contact with the ambers and a little away from the fire. Chemically it is CaCO3 and if you heat it enough it will start to decompose to CaO and CO2 and crumble. It is a similar process to what you would see in a cement kiln :); not exactly stable but also not dangerous if it happens outside.