Can you move equipment that is attached with Forged of the Fluff battlefield?

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

Ruling

According to FAQ 730, the Forge of the Fluft battlefield is explicitly listed as an effect that can move equipment even while it is already attached to a unit.

While standard "Equip" abilities on equipment cards cannot be activated while the equipment is attached (because the equipment's text box 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.

Timing and Usage

Because this is an activated ability granted by a battlefield, you must follow the standard timing rules for activating abilities:

1. Cost: You must pay the cost of the ability, which is exhausting your legend.
2. Timing: You must have priority to activate this ability.
   • If you are in a Showdown, you must have Focus to activate it.
   • If you are in the Main Phase (outside of a Showdown), you must have priority and the chain must be empty (or you must be responding to an existing chain item).
3. Targeting: You choose an equipment you control and a unit you control to attach it to. As noted in FAQ 730, this effect allows you to move equipment from one unit to another.

Important Clarification on Costs

Regarding the cost of this ability:

• The exhaust symbol represents the cost of exhausting the legend that is using the ability (Rule 401.5).
• You cannot activate this ability if your legend is already exhausted, as you cannot pay the cost (Rule 401.1.b).
• If you have multiple abilities that require exhausting your legend (such as a legend's own ability and the one granted by the Fluft), you must choose one or the other; you cannot exhaust the legend once to pay for both (see FAQ 1824).

Note: I could not fully verify the exact ability text or the exhaust symbol notation against the retrieved rules.