How to make models free?

How to make models free?

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Craft ID
Revision 0
Parent
Original

If someone tells me how ill make all my models free

Specifications

Length 5.75 m
Width 2.75 m
Height 1.5 m
Weight 4.58 t
Toughness 2240
Offense 60
Defense 1130
Thrust 30600
Output 3700
Cost Coin 330000 / Gold 0
App Version 1.3.2