Cart Hat Saddle with Brim Clip - Backstage cart lip (one piece, strongest)
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What it holds: Hang a cap or sun hat on a smooth vented crown dome. A sprung jaw pinches the brim so wind can't take it.

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_QI_hat_saddle_lip.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: Strongest: one piece with the Magliner / cart-lip block, the holder joined to it across its full width. Sits at the same height as the docked version. Fit the M5 heat-set insert(s) + thumbscrew. Prints upright, floor down; use build-plate-only supports under the 14 mm deck-side flange of the lip block only. Prints upright with the snap-off breakaway pad under the dome (snap it off after printing).

HOW IT WORKS
  The hat's crown rests on a smooth 90 mm dome, so straw and structured crowns keep their shape. Three through-vents let a sweaty band dry. Tuck the brim (or a cap's visor or back strap, 1-5 mm) up into the sprung jaw above the dome: it bites at 0.8 mm, and the flared lip guides it in. The crown edge always sits at the top of the dome, so the jaw meets the brim on any hat size. There is a 9 mm lanyard eye at the foot for a hat leash or carabiner. Beanies just pull over the dome.
  After printing: snap off the print aids: the flat pad and the two thin webs under the dome (held by small tabs over a 1.2 mm gap) and the two little pins under the jaw's flared foot. They are there because the dome hangs 70 mm forward of the foot while it prints. Clean the tab marks with a knife or a file.
  Test the jaw first: the jaw gap is 0.8 mm, printed upright. If it strings shut, run a knife through it once; if it grips too lightly on a thin cap visor, that is normal: the leaf's spring does the holding.
  Mount (DOCK): the holder has a DOCK tongue on its back. It drops into any DOCK adapter from above and clicks: the cart-lip adapter A_MLN_lip (3.4 mm Magliner / Backstage shelf lip), the ToughBuilt bar adapter or the round-tube adapter. To swap it, press the latch pad beside the receiver and lift. Print the DOCK coupon first to choose the fit. The M5 x 25 lock screw is required on a moving cart. It is 90 mm wide and light, so one tongue is in spec.
  Cart facts (on A_MLN_lip)

  - Sticks out 87 mm from the cart side
  - Hangs 128 mm below the deck; holder top 34 mm above the deck
  - Overall 78 x 90 x 162 mm

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/#qi-hat-saddle

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.
