Sunscreen Tube + Bug Spray Can (Quiet, Bounce-Proof) - Backstage cart lip (one piece, strongest)
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What it holds: Sunscreen tube cap-down and a bug-spray can side by side. A spring finger stops the tube rattling, the can leans back into a tilted cup, and windows show what's left.

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_QA_sun_bug_twin_c53_lip.stl  (supports: no (unless your slicer warns))
  - H_QA_sun_bug_twin_c66_lip.stl  (supports: no (unless your slicer warns))
  - QA_tube_sleeve.stl  (supports: no)
      how it lies on the plate: upright (chamfered end on the bed), 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: Strongest: one piece with the Magliner / cart-lip block, the holder fused to an 8 mm back plate that bears on the cart side down to the holder bottom. Sits at the same height as the swappable version on the Magliner adapter, 7 mm closer to the cart. Fit an M5 heat-set insert + M5 thumbscrew. Prints upright, floor down like the swappable version; use build-plate-only supports under the 14 mm deck-side flange of the lip block only. Two can sizes: print c53 (53 mm can) or c66 (66 mm can); the small-tube sleeve is the same for every version.

HOW IT WORKS
  People reapply sunscreen and repellent when they can see them. When they're buried in a bag, they skip them. This twin holster keeps both at hand height on the cart.
  Left cup (oval, 60 x 40 mm inside, 75 deep): a sunscreen squeeze tube stands cap-down, so the lotion is always at the nozzle. Fits 8 oz tubes (about 57 x 38 x 190 mm), which stand about 115 mm proud for a full-hand grab. A hanging spring finger low in the cup presses on the tube's thick shoulder, so it doesn't rattle on a rolling cart (no clatter on set). Smaller 3-6 oz tubes (about 50 x 30) go in the QA_tube_sleeve: drop it in and it clicks under the same finger.
  Right cup (round, leaning 10 degrees out): an aerosol can. A can standing straight up can walk out on vibration, so the bore leans out from the cart: its weight settles it onto the tilted floor and against the cup wall, and two spring fingers at the front corners press back on it so it can't chatter. It is a firm friction fit, not a lock: lift the can and it comes out. Two versions: c53 fits 53 mm cans (OFF! Deep Woods 6 oz is 53 mm, and many SPF sprays are too) and c66 fits 66 mm cans.
  Sun and rain: a tall arched window at the front of each cup shows the label and how much is left, vents heat and drains. Every floor has drain holes at its lowest point.
  Aerosol heat warning: spray cans are labelled 'do not expose to temperatures above 49 C / 120 F'. Don't leave the can in the holder in direct midday sun or on a cart parked in a closed truck. Park the cart in shade, print in a light colour, and use ASA if it lives outdoors.
  Mount: a DOCK tongue on the back (a 38 mm, 45 degree dovetail with a click latch). It drops into any DOCK carrier adapter in this collection: the Magliner/Backstage 3.4 mm shelf-lip adapter (A_MLN_lip), the ToughBuilt bar adapters (A_TBB_bar) or the 19-32 mm tube adapter (A_TUBE). Push the latch pad and lift to swap holders one-handed. Nothing on the holder rises over the latch pad or the lock screw. The adapters are a separate download.
  Cart facts (on the Magliner lip adapter)

  - Sticks out 92 mm from the cart side
  - Hangs 44 mm below the deck; the holder top is 34 mm above it; the items stand above it
  - Part size 83.3 x 105.3 x 78.0 mm (out x along x up)
  - c66 version: sticks out 105 mm, about 136 g
  - Small-tube sleeve: about 25 g

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/#qa-sun-bug-twin-c53

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.
