Eartec UltraLITE Crew Row (3 + MAIN) - Backstage cart lip (one piece, strongest)
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What it holds: Headset bays for a 4-person UltraLITE kit: head-form saddle and a spare-battery pocket per headset; one bay marked MAIN.

PRINT SETTINGS
  Filament:  PETG
  Walls:     5
  Infill:    35% gyroid
  Orientation: the files are already oriented for printing. Put them on the plate as they load;
               don't rotate them.

FILES AND SUPPORTS
  - EB_crew_bay.stl  (supports: no)
      how it lies on the plate: standing on the y0 end face (STL already oriented), no supports
  - EB_master_bay.stl  (supports: no)
      how it lies on the plate: standing on the y0 end face (STL already oriented), no supports

HOW IT MOUNTS
  BACKSTAGE CART LIP (ONE PIECE, STRONGEST)
    The cart-lip slot is printed into the holder, so it is one piece and as strong as it gets.
    Hold it tilted, hook the slot over the upright lip on the edge of a Magliner / Backstage-style cart
    shelf, and rock it down until it sits flat against the side.

    Notes for this holder: One piece with the Magliner/cart lip block (shipped). Print 3 x crew bay + 1 x MAIN bay.

HOW IT WORKS
  A comms station on the cart for a four-person UltraLITE kit: three crew headsets plus the MAIN, each with its own spare battery right beside it.
  What it is
  Each bay is the UltraLITE head-form saddle (the same as the Double Saddle) plus a pocket on the end that holds one spare LX600Li pack standing up, 12 mm proud for a one-handed grab. Bays are 226 mm long: print three crew bays and one master bay for a 904 mm row. Butted end to end, neighbouring cups clear each other by 16 mm if your cups are 44 mm deep (pad face to outermost point, boom pivot included). Measure one first: for every mm deeper, space the bays 2 mm apart instead of butting them, and lock each with its thumbscrew. The master bay has MAIN engraved on its pocket, so everyone knows which headset runs the system (the UltraLITE MAIN headset must be on for the remotes to talk). Crew bays have a recessed flat for a name or position label.
  How it holds

  - The band lies across a roof shaped like the inside of a headband, in a trough between an 8 mm back stop and a 5 mm front nub, so it cannot walk off toward or away from the cart.
  - Each ear pad nests in a cradle at the end of the part: a tall oval mouth with a 4 mm deep seat. The band's own spring presses the pads into the seats, so the cups cannot swing on a moving cart. The oval is tall, so the cradle works with the band at any length.
  - The top and front edges of each seat have a 45 deg lead-in, so lifting the headset up or pulling it toward you opens the band by itself. The back and bottom edges keep the full 4 mm, so bumps do not shake it out.
  - Mic boom: swing it UP before you hang the headset. Eartec booms auto-mute in the UP position, so a parked headset is silent on the channel. The boom pivots in the middle of the cup's outer face and stands straight up beside the part. Nothing on the holder touches it.
  - One hand: lower the headset straight down over the part. The pads ride down the trumpet sides and drop into the seats. To take it, lift it straight up.
  Single-ear UltraLITE headsets: use the Single Saddle. In a bay their large temple pad only rests on the rim.
  Check your headset (2 minutes with a ruler)
  1. Pad to pad: hang the headset on your hand and measure between the two ear-pad faces with the band at its shortest. It should be 110-125 mm (the saddle holds them 126 mm apart, so the band's own spring presses the pads into the cradles).
  2. Ear-pad diameter: 62 mm or a little smaller fits the 64 mm cradle.
  3. Crest to cup centre: from the inside top of the band to the middle of the ear pad, band shortest and longest. The cradle covers 95-125 mm.
  4. Cup depth: from the ear-pad face to the outermost point of the cup, including the boom pivot. Drawn at 44 mm; it sets how much free lip each end needs.
  Also measure one LX600Li pack: the pocket is 12.5 x 34.4 mm inside and 28 mm deep, drawn from a published 40.1 x 33.0 x 11.1 mm replacement pack.
  Sizes are estimates. Eartec does not publish headset, ear-cup, band or boom sizes. This part is drawn from photos and the published weights, with generous tolerances. Before you print, measure your headset (see "Check your headset") and compare with the numbers here.
  Numbers

  - Sticks out 85 mm from the cart side (the part itself)
  - Hangs 162 mm below the deck; the block top stands 42 mm above it
  - Takes 226 mm of the lip; needs 45 mm of flat cart side below the lip for the back plate
  - Row of 4 bays: 904 mm of lip (butted)
  - 103 x 226 x 204 mm (out x along the cart x tall)

OTHER MOUNTS
  The same holder also comes ToughBuilt bar (one piece), Dock (swap between mounts), Mountless (desk, shelf, case or screw to a panel). Pick the mount on the site: https://cart-tools.sdos-placeholder.workers.dev/#eb-crew-bay

TEST THE FIT FIRST
  Carts, bars and tape rolls vary a little. Before a long print, print the small fit test from the
  Test pieces section of the site (or this part at low infill) and check it on your own gear.

Not affiliated with or endorsed by Magliner, Backstage Equipment, ToughBuilt, Milwaukee, Hollyland, Eartec, Sekonic, Inovativ, Matthews or Manfrotto. Brand names only say what a holder fits.
