While Superior and Rare guilds do not require membership to craft items, each normal guild requires a membership fee of (typically) 150 gold crowns.
NOTE: Players may only hold an active membership in one weapons guild at a time. Joining a second guild will unenroll the player from their previous guild. In order to craft the previous weapon, the player must again pay 150 gold crowns to rejoin that guild.
List of Weapons Guilds