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[Jake]

Every time I embarked anywhere near magma in 40d it ended with everyone dead or insane before the first caravan arrived. I refuse to go anywhere near the stuff now.

[Eric Blank]

It's perfectly safe now. Haven't seen a fire snake (or purring maggot for that matter) since 31.01 came out, and fire imps and magma crabs tend to stay downstairs now, so your chances of experiencing unintentional !!FUN!! are very, very low. I even gave up making a hundred and two airlocks between my fortress and my magma forges!

[Loud Whispers]

It's perfectly safe now. Haven't seen a fire snake (or purring maggot for that matter) since 31.01 came out, and fire imps and magma crabs tend to stay downstairs now, so your chances of experiencing unintentional !!FUN!! are very, very low. I even gave up making a hundred and two airlocks between my fortress and my magma forges!

I've had purring maggots before... But this was before I deemed them of any use. Never seen them since.

[Asymptote]

ahem...

Spoiler (click to show/hide)

MUAAHAHAHAHAHHA

Got about 15 goblins in the trap... after the stack was complete had to wait over a year before I got another siege. Two militia dwarves were left outside, one died but the other fought of nearly 20 speargoblins+trolls... (he didnt kill them all, just stayed alive until they broke). So total casualty count for the magma trap comes to:
- 16 to the exploding alchol incident
- 3 to the resulting tantrums
- one miner who was too slow
- one militia dwarf caught outside.
- 15 goblin lashers

But it works!

In other news, half the map is on fire.

[tryrar]

In other news, half the map is on fire.

Oh so sigged!

[Asymptote]

Yah.... suffice to say as much effort wasn't put in to the magma disposal system as the magma delivery system =/

[thegoatgod_pan]

My only attempt at a magma trap was a squidlike structure operated by bridges emerging from a volcano.

The bridges turned out to not be magma safe.

There was almost no way to stop it from constantly pouring out magma, short of draining the huge reservoir onto the ground--the valves were right by the volcano.

When goblins came they ignored the large pools of magma and marched easily up a ramp I missed into the fortress proper. 
No one survived.

[Quietust]

16 dwarves killed pretty much instantly in a massive alcohol fireball. I had no idea that could happen... deadly.

Actually, I'm pretty sure it didn't happen - when exposed to fire, alcohol boils (which is unlikely to inflict any serious damage) but it does not burn.

[dr_random]

I've always been afraid of forgetting to make one vital piece of equipment non-magma safe, the massive FPS drop (just turning on tempreture halves my FPS in my current fort).. but mostly the perceived amount of effort involved.

I'm no stranger to hard work... my current fort Wetringed is a 20x20, 45 zlevel above ground tower, made entirely from marble, running water, 3000 excess power, drainable moat, etc etc. But I've started on a magma spewing death-trap for the entrance, and it just seems too much. I've got the power to where it needs to be, my magma reservoir is slowly filling as I type, but... as far as I can tell, I will need a magma pump stack of 80+ levels.

Tell me true, oh forum, is it worth it?

Eh? I didn't bother about this stuff for a long time also, but when you got the things handy (volcano) you can just make a trap ouside, safely away from the fortress. Add some doors for sealing things and have fun. Use a man-powered pump. Is there a flaw, the dying Mr Pump will cease pumping, stopping the flow effectively. Small traps won't hurt the FPS much.
Important advice: Temperature must be enabled. Else this will all be a big disappointment.
For my part: I'm still about to figure out how waterwheels work. The wind wheels never worked.
Are they worth the effort?

[Necro910]

Asymptote, magma is the true dwarven way.

Remember...

Spoiler (click to show/hide)

[flieroflight]

i have build mgma trap, theyve just never worked.

[Necro910]

i have build mgma trap, theyve just never worked.

Remember...

Spoiler (click to show/hide)

[Telgin]

I have yet to try a magma trap myself, although I planned it for this fort.  I had absolutely no easy way to build magma safe pumps though: no magma safe metal ores and no sand to make glass parts.  I started buying sand off the traders to make glass parts, but it's a slow process to build the 60+ z-level stack.  This being my first time, I fully expect terrible things to happen in the process.

Then a deadly dust forgotten beast showed to and killed 40% of the population, so I probably won't manage to pull it off this time.  I'll probably try again on my next embark, possibly with a more shallow world gen next time.

I want a magma moat darn it!

[Ifeno]

i built a f*** the world lever once.  Then i accidentally the whole off switch.  Let's just say i havent gotten imigrants or merchants in a REALLY long time...

[AWellTrainedFerret]

I've shied away from !!MAGMA!! traps for fps reasons, but no my fort is drowning in cheap clothes and I need 4 smelters running full time melting down copper and iron armor. I guess Magma really is the solution.