Can I reattach an already attached equipment if I control Forge of the Fluft?

Yes, you can use the ability granted by the Forge of the Fluft battlefield to move equipment that is already attached to a unit.

According to RiftJudge FAQ 9046, while standard "Equip" abilities on equipment cards cannot be activated while the equipment is attached (because the equipment's rules text becomes inactive), the ability granted by Forge of the Fluft is a separate ability provided by the battlefield itself. Because this ability exists on the battlefield and not on the equipment card, it remains active and can be used to target and re-attach equipment that is currently attached to another unit.

To use this ability, you must follow standard timing and cost rules:

• Cost: You must exhaust your legend. You cannot activate this ability if your legend is already exhausted (Rule 401.1.b).
• Timing: You must have priority to activate this ability. If you are in a Showdown, you must have Focus. If you are in the Main Phase, the chain must be empty (or you must be responding to an existing chain item).
• Restriction: Per FAQ 8705, you cannot use this ability to reattach an equipment to the same unit it is already attached to, as that has no effect. You must target a different unit.