Custom separator trick for i3blocks

custom-separator-trick.conf

# We use the global settings as a shortcut to define our own separator.
# Based on the default i3blocks config file.
full_text=〉
align=center
color=#666666
separator=false
separator_block_width=7

[volume]
command=/usr/libexec/i3blocks/volume
color=#6D6DFF
signal=10

[separator]

[memory]
command=/usr/libexec/i3blocks/memory
color=#FFFFFF
separator_block_width=13
interval=30

[swap]
command=/usr/libexec/i3blocks/memory swap
color=#FFFFFF
interval=30

[separator]

[disk-home]
command=/usr/libexec/i3blocks/disk $HOME
color=#FFFFFF
interval=30

[separator]

[wireless]
command=/usr/libexec/i3blocks/network wlan0 W
color=#00FF00
interval=10

[separator]

[ethernet]
command=/usr/libexec/i3blocks/network eth0 E
color=#00FF00
interval=10

[separator]

[cpu]
command=/usr/libexec/i3blocks/cpu
color=#FFFFFF
interval=10

[separator]

[battery]
command=/usr/libexec/i3blocks/battery BAT0
color=#FFFFFF
interval=30

[separator]

[time]
command=date '+%Y-%m-%d %H:%M:%S'
color=#6EFF6E
interval=5

If you include a full_text= in each useful block it prevents your separator being used when the block has no ouput.