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Cardboard tubing that is sent on a roll from Small Parts Inc.
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I'm assuming you mean the cardboard box that the axles came in. That is packing material and may not be used
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Velcro to secure the robot to the floor (we drag it behind us as we move)
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This would be damaging to the playing field and I believe is specifically stated against in the rules. (someone verify please)
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String netting (Like on the sides of soccer goals)
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This could pose an entanglement hazard so I would use caution.
As for the pvc i'm tempted to say you can but i'm not positive so i'd check with someone else.