The quest for a better incense stand to reduce the rocket diameter led to some common household products.  A common glass bottle cap would make a good bowl.  This would be crimped on to the downcomer.  A toilet roll tube would be the right size for the downcomer. 

This plastic pipe idea leaked at the interface.

Then the pipe melted.

https://www.amazon.com/Louis-Crafts-Gauge-Aluminum-Inches/dp/B0042SSQMU/

There was once a heavier duty aluminum foil in the apartment that was soft enough to shape but rigid enough for structures.  It since disappeared.  It seems to be 36 gauge aluminum foil & is now super expensive.

An aluminum pie pan might be formable into the required shapes.

A long search revealed no metal tubes or even toilet roll tubes of the right size locally.  These are super expensive by snail mail.  Years ago, such things were sold at the homeless despot & art stores.  Now, they only have finished goods.

A few tries at rolling tubes out of aluminum sheet revealed some problems.  The custom aluminum tube still required masking tape.  A bowl out of common al foil does the business but the excess material takes a lot of space.    It ends up requiring the same rocket diameter as the square stand.  The durability of the al foil is questionable.

Of all the designs, the original square stand was looking favorable.  It required less effort to manufacture than any other stand.  Somehow, masking tape proved immune to the high temperatures & it's easier to work with than metal.  The inner rocket diameter with the square stand is still bottoming out at 40mm.

This experience made lions wonder if there's a way to have a metal bowl supported just by a masking tape diaphragm that bisects the rocket.  The trick is making the adhesive face up.  The other problem is keeping the hot oil away from the PLA.

Attaching the hot section to PLA with masking tape instead of clay is still a worthwhile goal.  Air dried clay has had problems cracking inside the rocket tube when it dries & shrinks.  A tall enough stand might be cool enough to directly farsten to PLA.   The masking tape might be taking out fog.

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In the modeling department, the speaker stand of 2021 left behind some scripts for creating hex tubes.  The easiest method is seen as adding tile meshes instead of subtracting grooves with a boolean.