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User:Immibis/Ice generator

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This will only work if your map freezes, either all the time or only in winter. If it only freezes in winter, this will only work in winter. Note that if you build this on a glacier, none of the walls can be made of natural ice as they will melt. Turns out, if the water level's walls are made of natural ice, the melting is actually a good thing, as it eliminates the need for an external water source to start it.

Magma layer 1 (z0):

 #############
 #           #  # wall
 #           #  D lever-controlled door
 #           #  _ channel to drain
 #           #
 #           ###
 #           D_#
 #           ###
 #           #
 #           #
 #           #
 #           #
 #############

Magma layer 2 (z+1):

##############
#^           #  # wall
##           #  D pressure-plate-controlled door
 #           #  ^ pressure plate, triggers on 0-3 magma
 #           #
 #           ####
 #           D~~~ <-- magma input
 #           ####
 #           #
 #           #
 #           #
 #           #
 #############

Water layer (z+2):

 #############   # wall
 #...........### D lever-controlled door, for initial filling
 #...........D~# ~ external water source, for initial filling
 #...........### X lever-controlled floodgate for using water output
 #`X_# d door for ice-mining access
 #`X_# _ channel for water output
 #`X_# . subterranean floor (does not generate ice/water)
 d`X_# ` above-ground floor (generates ice and water)
 #`X_#
 #`X_#
 #`X_#
 #`X_#
 #############_#