Camera Thread / Mafer Clamp Plate
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Anything with female threads: cheese plates, rail plates, Savior-type clamps, magic-arm plates, the 1/4-20 hole on a super clamp. A_CAMERA_thread is for 3/8-16 screws, A_CAMERA_thread_q for 1/4-20. Two screws hold it square; one screw is light duty.

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.

WHAT IT IS
  A dock adapter. It holds the receiver that any swappable holder on the site clicks into: print the
  holder's Dock (swap between mounts) version, fix this adapter to your carrier, and drop the holder in
  from above until it clicks. Press the release pad and lift to take it off.
  Lock screw (every adapter): 1 x M5 short heat-set insert + 1 x M5 x 25 knurled thumbscrew (DIN 464) in the 45-degree lock boss. Optional on a bench, use it on moving carts and lift gates.

FILES
  - A_CAMERA_thread.stl
      fits: anything grip / camera with female 3/8-16 threads (or 1/4-20, light duty, see A_CAMERA_thread_q): cheese plates, Inovativ-type rail plates, Savior-type clamps (2 x 3/8 + 2 x 1/4), magic-arm plates
      fixing: FIXED hole H1 (10.0 clear, 3/8-16) + a second screw in the DOWN slot or the RIGHT slot, 12-28 mm from H1 (1/2 in, 15 mm, 3/4 in, 1 in pitches). Both heads sit 6 mm deep in one counterbore, under the holder. Fit with the holder off (hex key from the front)
      screw length: grip = 6.0 mm under the head + 1.0 mm pad = 7.0 mm. Default 3/8-16 x 5/8 in (8.9 mm engaged, about 5.6 threads). 3/8-16 x 1/2 in engages only 5.7 mm: use it only where the threaded hole is shallower than 9 mm
      hardware: 2 x 3/8-16 x 5/8 in button-head socket screw (7/32 in hex); 1/2 in only on plates with under 9 mm of thread
      hardware: 1 mm rubber or TPU sheet, 50 x 40
      hardware: optional: small O-ring on each screw behind the plate keeps it captive
      rating: 1.5 kg with two 3/8-16 screws + lock screw. ONE screw, or 1/4-20 screws: 0.5 kg, not lift-gate, rubber pad required
      on the plate: on its -y cheek (latch arm and tab flat on the bed), no supports; the long counterbore ceiling is a 45 deg slope and the right arm ends in a teardrop point
  - A_CAMERA_thread_q.stl
      fits: the same, for female 1/4-20 threads: 1/4-20 cheese plates and rail plates, Savior-type clamp 1/4-20 holes, the single 1/4-20 hole on an Avenger / Manfrotto super clamp (one screw: light duty)
      fixing: FIXED hole H1 (6.6 clear, 1/4-20, 0.3 mm play per side so two screws hold it square) + a second screw in the DOWN or RIGHT slot, 12-28 mm from H1. Heads (11.1 button) sit 6 mm deep in a 13.0 counterbore
      screw length: grip 7.0 mm (6.0 + 1.0 pad). Default 1/4-20 x 5/8 in (8.9 engaged, 7 threads); 1/2 in (5.7 engaged) only on plates with under 9 mm of thread
      hardware: 2 x 1/4-20 x 5/8 in button-head socket screw (5/32 in hex), no washer needed
      hardware: 1 mm rubber or TPU sheet, 50 x 40
      hardware: optional: small O-ring on each screw behind the plate keeps it captive
      rating: 1.5 kg with two 1/4-20 screws + lock screw. ONE screw (super clamp): 0.5 kg, not lift-gate, rubber pad required
      on the plate: on its -y cheek (latch arm and tab flat on the bed), no supports; the long counterbore ceiling is a 45 deg slope and the right arm ends in a teardrop point

TEST THE FIT FIRST
  Print the fit coupons from the Test pieces section and check them on your own gear before a long print.

Holders that click into it: https://cart-tools.sdos-placeholder.workers.dev/

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.
