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[Trif]

Your carts don't skip in that setup, they just fly over the gap. Try a 4-tile or 5-tile gap and you might start seeing some mist.

[iofhua]

I did some testing with a longer magma channel. It looks like a roller set to "high" speed will reliably skip a minecart after 3 spaces. I will try carving another magma mist trap with that in mind. Also I learned that apparently two minecarts can't occupy the same space? They will land on top of each other, with one minecart sitting 1 Z-level on top of the one below it.

Spoiler (click to show/hide)

Roller at highest speed
Launching empty iron minecart
Skips on 7/7 magma:

*First Attempt*
skipped first time after traveling 4 spaces - mist
skipped second time after traveling 7 spaces - mist
sunk at 9 spaces - mist

*Second Attempt*
skipped first time after travelling 4 spaces - mist
skipped second time after travelling 7 spaces - mist
landed on top of previous minecart after travelling 9 spaces - no mist


Roller at high speed
Launching empty iron minecart
Skips on 7/7 magma:

*First Attempt*
skipped first time after traveling 3 spaces - mist
sunk after traveling 6 spaces - mist

*Second Attempt*
skipped first time after traveling 3 spaces - mist
sunk after traveling 5 spaces - mist

*Third Attempt*
skipped first time after traveling 3 spaces - mist
landed on top of previous minecart after traveling 5 spaces - no mist


Roller at medium speed
Launching empty iron minecart
Skips on 7/7 magma:

*First Attempt*
sunk after 2 spaces - mist

*Second Attempt*
sunk after 3 spaces - mist

[Kaos]

outside        inside
    .                .
    .                .
    .                .
T~==========~T

Key:
. is spike trap
= is minecart track
T is roller
~ is a channel filled with 7/7 magma

Don't know about rollers but a setup like that but changing the rollers for stops and having a dwarf pushing the cart instead would have the cart crash down the gap, you need at least one tile before the gap for it to jump over (if powered by dwarf power)


S=~========~=S

Something like the above will work for dwarf pushed minecarts, rollers push at higher speeds so they might not need the extra tile...