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Lure a Mella from the right by breaking the speed blocks or using Morph. Then manipulate it to go high enough to be used in the left doorway. Raise the Mella up to just below the door's ledge and then climb up to the door. Reposition the Mella once towards the door, and before it finishes moving, stand in the doorframe so that the next Mella movement will hit Samus. If it drops below the camera it will be necessary to go back down and raise it again.

Requires:

"canManipulateMellas"
"canCameraManip"
"canBePatient"
"canTrickyJump"
{
  "or": [
    "SpaceJump",
    "canTrickyUseFrozenEnemies",
    {
      "and": [
        "HiJump",
        "canSpringBallJumpMidAir"
      ]
    },
    {
      "and": [
        "HiJump",
        "SpeedBooster",
        "canWalljump"
      ]
    }
  ]
}
{
  "or": [
    "canTrickyDodgeEnemies",
    {
      "enemyDamage": {
        "enemy": "Mella",
        "type": "contact",
        "hits": 2
      }
    }
  ]
}
{
  "or": [
    {
      "obstaclesCleared": [
        "B"
      ]
    },
    "Morph"
  ]
}

Exit condition:

{
  "leaveWithGModeSetup": {}
}

Unlocks doors:

{"types":["ammo"],"requires":[]}