Precision Driver and Bit Block - Backstage cart lip (one piece, strongest)
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What it holds: 10 precision drivers + 46 x 1/4 in bits

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_OB10_precision_driver_block.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: One piece, strongest: native Magliner/Backstage 3.4 mm cart lip mount, optional M5 heat-set insert + nylon-tipped M5 thumbscrew. Prints on its end, no supports.

HOW IT WORKS
  Screwdrivers roll around in the drawer and loose bits vanish into pouches. This block parks drivers shaft-down and keeps a full grid of bits in view on the cart side.
  Ten stepped 8 mm holes on a 24 mm pitch for precision and electronics drivers (shafts up to about 6 mm, handles up to 22 mm across), the kind a camera assistant uses on rig builds. In front, 46 sockets for 1/4 in hex bits.
  Each driver hole has a 5 mm deep counterbore that seats the nose of the handle, so the driver stands upright and cannot walk sideways on a bumpy push. The shaft sits in an 18 mm deep guide and hangs out the bottom. To bounce out, a driver would have to jump its whole shaft length, so it stays put on a lift-gate drop.
  The bit sockets are tilted 15 degrees toward you so the tips are easy to read and pinch. Each hex socket is 6.7 mm across flats and 13 mm deep (a 25 mm insert bit stands 12 mm proud). Magnets: under each socket is a pocket for a 6 x 3 mm disc magnet. Drop it in through the hex and press it home with a bit; add a drop of CA glue if it is loose. With magnets fitted, bits stay in when the cart is rolled or dropped. Without them, bits sit loosely by gravity.
  A lightening channel runs along the underside behind the hole row. The holes go all the way through, so rain drains.
  Cart facts

  - Sticks out 56 mm from the cart side at the front of the bit grid (driver handles stay inside that)
  - Hangs 60 mm below the deck (driver shafts hang below that)
  - Needs 45 mm of flat cart side below the lip. Anything lower is set 2.5 mm back from the cart and hangs clear
  - Overall 74.2 x 248 x 102 mm (out x along x up)
  - Nothing of the part sits higher than the 42 mm mount block
  - Driver handles stand up beside the mount block; a 100 mm handle reaches about 65 mm above the deck
  Retention: held by gravity unless you fit the M5 thumbscrew. Press a short M5 heat-set insert (6.4 mm hole, 9 deep) into the deck-side face of the inner flange. A nylon-tipped M5 thumbscrew through it then clamps the lip, so the part cannot lift off on a bump, slide along the lip or rattle. Check first that your lip is at least 16 mm tall.
  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/#ob10-precision-driver-block

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.
