In the beginning I made sure that the plate on which the tea light will stand is not desintegrating - and even when the wax is fully liquified the plate does not get any hot. If so I would have just folded a piece of paper like 4x and placed it inbetween, flat and blocking all heat, but its not even needed.
And regarding the side walls: They dont get much heat, if I place a finger in the same distance like the walls are, then its just mildly warm. The walls act like a chamber of course, but they dont build up heat, as there are holes especially design to cause an air flow from bottom to top. Therefore with the chamber around the tea light it requires exactly the same distance to the banger and not a shorter distance like one would expect.
But even if one may be unsure, you could simply just remove the chamber and place the tea light on the open surface and place that folded paper below. This would be just super safe, but I'm totally confident it is also good this way. I burned quite some tea lights down to test it and indeed the lego does not get hot.
If the chamber does not hold back heat one may think whats the reason for it, but it will make the flame stop dancing around and be more focused, so the temperature will be even more stable inside of the banger. And with the holes from bottom to top there is still enough air stream to let the flame burn and let cool air in.
And regarding the side walls: They dont get much heat, if I place a finger in the same distance like the walls are, then its just mildly warm. The walls act like a chamber of course, but they dont build up heat, as there are holes especially design to cause an air flow from bottom to top. Therefore with the chamber around the tea light it requires exactly the same distance to the banger and not a shorter distance like one would expect.
But even if one may be unsure, you could simply just remove the chamber and place the tea light on the open surface and place that folded paper below. This would be just super safe, but I'm totally confident it is also good this way. I burned quite some tea lights down to test it and indeed the lego does not get hot.
If the chamber does not hold back heat one may think whats the reason for it, but it will make the flame stop dancing around and be more focused, so the temperature will be even more stable inside of the banger. And with the holes from bottom to top there is still enough air stream to let the flame burn and let cool air in.