Rig Parts Park Rail - Backstage cart lip (one piece, strongest)
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What it holds: Arca plates, 15/19 mm rods, clamps, rosettes on studs, under 1 kg; gate insert on a flat-topped boss

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
  - clip_NC_rig_parts_park_rail.stl  (supports: no)

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: Default: one piece with the Magliner/cart lip mount, strongest. Prints on its end, no supports. Fit the 2 x M5 mount thumbscrews (expensive load) and the gate thumbscrew.

HOW IT WORKS
  For the small, expensive, heavy bits that get lost in the cart drawer during rebuilds:

  - Arca channel: a 151 mm female Arca-profile channel (39.6 mm at the base, 33 mm mouth, 45 deg jaws). Generic Arca plates slide in from the open end and stop against the rod block. A 12 x 3.5 mm groove down the middle of the channel floor gives clearance for the safety stop screws or pins on the underside of many plates, so the plate sits flat in the jaws. At the open end, a thumbscrew (M5 x 20-25, head up to 20 mm across) in a heat-set insert on the flat top of a boss on the rail screws down into the channel as a gate, so plates can't slide out over bumps. Back it off a few turns by hand and the plate slides out; no tool needed. The hook stops 20 mm short of that end so the thumbscrew head has room. Plates up to about 140 mm long fit in front of the gate.
  - Rod sockets: two 15 mm and two 19 mm, 78 mm deep with closed bottoms (bores 15.6 / 19.6, 4 mm drain hole). Rods drop in from above the deck and stand along the cart side.
  - Studs: two 1/4-20 and two 3/8-16 heat-set inserts in the front of the lower band. Thread in a short steel stud (1/4-20 or 3/8-16 set screw, about 25 mm) and screw rod clamps, cheese plates or rosette adapters onto it. Threaded parts can't bounce off. The holes are 9.5 mm (1/4-20) and 12.5 mm (3/8-16), 13 mm deep, for common 0.5 in brass heat-set inserts. Check your inserts' recommended hole size.
  Keep the parked load under 1 kg in total. Rods are the heavy part: a 300 mm 15 mm aluminium rod is about 0.1 kg, but 19 mm rods are usually steel, about 0.67 kg per 300 mm. For example: an Arca plate, two 15 mm aluminium rods, one 19 mm steel rod of 150 mm or less, and two clamps. Two long 19 mm steel rods are too heavy for this rail.
  Cart facts

  - Sticks out 31.9 mm (the rail; the gate thumbscrew head stays inside that); about 46 mm with a rosette-size part on a stud. Rods stand up past the deck about 30-45 mm out from the cart side
  - Hangs 84.0 mm below the deck
  - Flat cart side needed below the lip: 84.0 mm
  - Overall 49.6 x 236.0 x 126.0 mm: needs a 256 mm bed
  - Hardware: up to 3 x M5 heat-set inserts (2 mount + 1 gate), 1-3 M5 thumbscrews, 2 x 1/4-20 + 2 x 3/8-16 inserts and studs
  Retention: held by gravity unless you fit the M5 thumbscrew. A short M5 heat-set insert (6.4 mm hole, 9 deep) goes into the deck-side face of the inner flange; a nylon-tipped M5 thumbscrew through it clamps the lip, so the part cannot lift off on a bump or a lift-gate drop, slide along the lip or rattle. Check your lip is at least 16 mm tall first. Two M5 insert holes in the hook, at 64 mm and 44 mm either side of the rail centre.
  Fits: Backstage Equipment and Magliner-style carts with a 3.4 mm upright shelf lip. The mount drops onto the lip from above: 3.7 mm slot (0.3 mm clearance), 26.6 mm deep with a round end, 0.5 mm chamfers at both slot ends.

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/#nc-rig-parts-park-rail

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.
