Oi mates.

Just got my tarantula and inside tha package there are three ( :/ ) extruders. Two Flex and one Titan.
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What is the difference? What shall i use? Are both - Flex and Titan - work with all materials? (PLA, ABS, PETG, Wood, PVA)
Tha "flex Extruder" is the "Pro Metal Extruder" or this is different?