The wrench fits tight on barrel nut and it's pretty strong. You can stick into it bit screwdriver up to 10mm in diameter, but tightening it with hand only will be enough. Be careful not to use too much force, if you tighten the nut well, and barrel still wobbles it might be caused by not enough spacers between outer barrel and nut.
4 walls or more, 40% infill(cubic/gyroid etc), pla may do the job for some time
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