Well... you know these clothes lumberjacks wear (or should wear) safety jackets and stuff filled with aramid fibers?
Those really aren't long (i doubt longer than 1m), but those clothes are made to get ripped by chainsaws, get those fibers into the chainsaw, wrap them around anything moving and get them stuck.

just build a wooden bot, use some staples to put pieces of those clothes on there -> boom, spinner-proof wooden bot.

Well, if you survive the first hit, that is... would have to try and go for just a light touch early on.

And i'd pity any roboteer having to clean those fibers out of any rotating stuff inside...


Just realised: 1m per bot meaning also 1m total, or is it 1m per bot per string (and multiple strings allowed)?

Forget my idea if it is 1m total.
And absolutely forget it if i can finish my spinner before the event in germany in april and you want to go there