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[Yaur]

After a breach of the magma see I was left with unfiltered magma coming into my prospective magma channel (not shown are a grate and screw pump further to the south).  I would like to fill it and was under the impression that this configuration:

would cause a cave in and seal the breach, but obviously it isn't... so what am I missing here?

[i2amroy]

It's a little difficult to tell since I don't use tilesets, but is there a floor above that "hanging" piece of wall? In order for a piece of wall to cave-in it has to be unsupported in all orthogonal directions, including both up and down. Also keep in mind that only natural walls will leave a wall behind after they fall, constructed ones will just break apart.

[Yaur]

There isn't anything to the sides or top, though the tile below is a magma immersed upward ramp, which must be what is holding the pillar up... however since it is a constructed wall it isn't going to matter anyway.  Next strategy, zone it as a pond and hopefully turn it to obsidian.

[Zealord]

The ramp is probably holding it up. Try to remove it.
I think this is the problem which is totally legit.

[i2amroy]

There isn't anything to the sides or top, though the tile below is a magma immersed upward ramp, which must be what is holding the pillar up... however since it is a constructed wall it isn't going to matter anyway.  Next strategy, zone it as a pond and hopefully turn it to obsidian.

Make sure that you zone your pond at least 2 levels above the magma (so that there is a level of empty space between the pond level and the magma level. If you don't then all you will get is steam instead of the magma obsidianizing.

[Quietust]

If I'm reading your pictures correctly, this is what you've got:

Code: [Select]

Z+0   Z+1   Z+2

77#77 ##### #####
###77 #...# #   #
 #7## ..W.# # . #
 #### ....# #   #
 #r#  .._## #####
Nothing is ever going to happen in that setup, since the "W" wall you're trying to drop (from Z+1) is already anchored by 4 adjacent floors.

You would need to have the wall suspended at Z+2 (and your current Z+2 replicated at Z+3) before it would fall down.