does anyone know if it is legal to use string on your robot in vex IQ?
< R7> VEX IQ parts only. Robots may be built ONLY from official robotic components from the VEX IQ product line, unless otherwise specifically noted within these rules.
a. Official VEX IQ products are ONLY available from VEX Robotics & official VEX Resellers. To
determine whether a product is “official” or not, consult www.vexiq.com.
There isn’t a line anywhere about “string” in the rules as an exception, and looking at the website, there is no official string. The closest I can see is the “Pulley Base Pack”, but since you cannot cut Vex IQ parts due to < R13>, that’s a pretty clear no.
thanks mate, i was wondering because we have an robot that has and intake and we were going to use a stringdexer, but we can use a mechanical indexer 
If I’m not mistaken 240P was the first team to use the so called “stringdexer” (string indexer) during Turning Point. I forget which reveal it was exactly though.
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Sorry, I didn’t see the post was already solved 
Technically, there are legal fixed-length string elements that you can use in the VEX IQ Challenge.
Currently, they are only available in fixed length 12x Pitch Rope (228-2500-430), 20x Pitch Rope (228-2500-436), and 24x Pitch Rope (228-2500-438) lengths.
All of these rope elements have plastic ends that snap onto VEX IQ pins or shafts, and can be locked onto the 1x Wide Spool (228-2500-420) by putting a shaft through it.
Kits that contain the 12x Pitch Rope
Catapult (Original 2015 version)
Catapult V2 (improved 2019 version)
Kits that contain the 20x Pitch Rope
Crossbow (Original 2015 version)
Trebuchet (This kit contains 5x of the 20x Pitch Rope elements, as well as the new 75 gram weights and a ratchet and pawl mechanism)
Kits that contain the 24x Pitch Rope
Crossbow V2 (Improved 2019 version)
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Please don’t revive dead posts