From the Loftsmith community

Dry-break dust cap with O-ring

Keeps grit and dust out of an open dry-break fitting when it's not in use. The rim is fluted so it's easy to twist on and off, and the cap is shaped to hold an O-ring a short way in from the mouth. Set your fitting's width and how far it sticks out.

1 part · 15 g · 57 × 57 × 24 mm

Short round red cap with a fluted, wavy edge all the way around
Loading the 3D view
Loading the 3D view
No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Change it in the Studio

Parts

  • cap · PLA · Top face down on the bed, opening facing up

    No supports needed

Print settings

Layer height
0.2 mm
Walls
3
Infill
15%
Supports
None
Notes
Print it top face down so the groove prints cleanly.

Hardware

  • Nitrile (NBR) O-ring, about 44 mm ID x 2.5 mm cord · Choose an inside diameter equal to or up to 3% smaller than your fitting's outside diameter. Nitrile holds up to fuel

Assembly

  1. Stretch the O-ring into the groove inside the cap by hand, and make sure it isn't twisted.
  2. Push the cap straight down over the fitting. Twist it slightly as you pull to take it off.

Good to know

  • I guessed the fitting size (45 mm across, 20 mm tall), so measure yours and set the sliders before printing. If it's too tight or too loose, try the Bore clearance slider or a slightly different O-ring.
  • PLA softens at about 55 °C. If the cap will sit near a hot engine or out in the sun, print it in PETG or ASA instead.
  • The O-ring stretches into its groove by hand, so the 3D view can't animate that step. The view just shows it seated.
I printed this Remix

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