Use PC or similar material to withstand the temperatures, however, PETG should be fine for single use. Just don't use PLA :)
M3x25 screws with M3nS nuts to hold the halves securely together but could be also used without it, just with a tape holding it.
Let it cool down for several hours before opening, it's quite a lot of paraffine/wax, which holds the temperature pretty well…
The author marked this model as their own original creation.