3/8 in Socket Rail, Metric 10-19 mm, Click Posts - Backstage cart lip (one piece, strongest)
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What it holds: Sockets click onto spring posts and stay on when the cart bumps. Labelled sizes, seat rings, graduated spacing.

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
  - H_RL_socket_rail_metric_lip.stl  (supports: no (unless your slicer warns))
  - H_RL_socket_rail_metric_lip_base.stl  (supports: no (unless your slicer warns))
  - H_RL_socket_rail_metric_lip_text.stl  (supports: no (unless your slicer warns))

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: rail bottom level with the deck, so it stands up beside the deck and prints upright with no supports. Optional M5 lip clamps. ~332 g. Two-colour labels: print <name>_base + <name>_text together as one object (same placement); one colour: the plain file.

HOW IT WORKS
  A labelled home for the 3/8 in drive sockets that ride with a cordless ratchet or impact: 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 mm.
  The click: each post is split and springy, with a small bump on both faces. Push a socket on and the bump snaps into the socket's own ball-detent hole. It stays on through bumps and comes off with a firm pull. Each socket sits in a shallow seat ring with its size on the ledge front, so a missing one shows at once.
  The spacing grows with the size: typical 6-point chrome sockets, 17 mm OD at the small end and 25.6 mm at 19 mm / 3/4 in. The tallest socket top stays below the holder top. The ledge is the bed face, so the rail prints flat and strong.
  Mounting (DOCK system): the back carries two DOCK tongues 60 mm apart. Drop it into two DOCK adapters (Magliner / Backstage lip, ToughBuilt bar, round or square tube, T-slot, all in the DOCK system listing) and it clicks in. To take it off, push the release pad with your thumb and lift. Riding a truck lift gate: fit both M5 lock screws (2 per twin holder). Print the DOCK coupon first.
  Cart facts (on two lip adapters)

  - Sticks out 52 mm from the cart side
  - Top sits 34 mm above the deck; lowest point 38 mm below it
  - Overall 44 x 267 x 72 mm (out x along x up), tongues included

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/#rl-socket-rail-metric

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.
