Thread major and minor diameters
Measure crest and root diameters at several positions and check whether the real profile is tapered, damaged or out of round.
Editable replacement-cap template
Build a measured threaded replacement cap with a gasket-seat trial
This starter uses a 38 mm major diameter, 35.2 mm minor diameter and 3.5 mm pitch to create a one-start internal thread. It adds a knurled grip and shallow gasket recess, while keeping thread fit and any sealing experiment explicitly separate.
A prototype closure derived from measured thread geometry—not a certified cap, seal or container component for fuel, chemicals, pressure, transport or hazardous contents.
What to measure first
The starter dimensions are there to make the controls understandable. Replace them with evidence from the real part, space and print setup.
Pitch, starts and handedness
Count axial pitch and thread starts separately, establish lead and confirm the turning direction before modelling the helix.
Thread width and entry
Record ridge width, the axial position of the first complete thread and any unthreaded rim lead-in needed for assembly.
Container lip and gasket
Measure the actual lip, available deck, gasket section and compression plan independently of the thread dimensions.
Published starter settings
These values produce the preview shown above. They remain editable after the template opens in the EazyMake studio.
ThreadØ38 / Ø35.2 × 3.5 mmMajor diameter, minor diameter and axial pitch.
Thread depth1.4 mm radialHalf the 2.8 mm major-to-minor diameter difference.
ProfileOne-start rounded, right-handLead equals the 3.5 mm pitch for one start.
Cap body16 mm high2.2 mm wall and 3.2 mm top thickness.
Starting clearance0.25 mm radialTest rings compare 0.15, 0.25 and 0.35 mm.
Entry3.6 mm start + 2.5 mm lead-inKeeps an unthreaded opening before the helix engages.
Gasket recess2.4 × 0.6 mmWidth × depth; geometry alone does not prove sealing.
From measurement to printable part
The generator keeps the important decisions visible and carries one parameter set through geometry, inspection, calibration and export.
Measure the real external thread
Capture diameters, pitch, starts, handedness, profile, ridge width and entry position rather than scaling a visually similar cap.
Set the cap envelope
Choose wall, height, top thickness, grip and lead-in while preserving enough material around the internal thread and gasket deck.
Treat the gasket as another interface
Enter a recess only after measuring the lip and gasket; thread engagement does not define squeeze or sealing behaviour.
Print the three clearance rings
Test the tighter, selected and looser female rings on the cleaned, empty counterpart using the final print setup.
Prototype the complete closure
Inspect thread entry and recess backing in the slicer, then test thread and gasket behaviour separately within a safe non-hazardous plan.
Print notes
- Print the three clearance rings first in the same orientation, material, nozzle, layer height and profile as the cap.
- Record the lowest-clearance ring that engages smoothly without binding or damaging the measured counterpart.
- Inspect the first thread, unthreaded lead-in, top backing and gasket recess in the slicer before the complete print.
- Use only an empty, cleaned, non-hazardous counterpart for dimensional trials and keep all contents out of scope.
Know the limits
- Do not use this printed cap for fuel, hazardous chemicals, pressure, transport or certified containment.
- A shallow gasket recess does not establish compression, material compatibility, liquid tightness, gas tightness or repeated-use sealing.
- Thread-ring success proves only the tested printed fit; it does not prove the cap body, gasket interface or final application.
Common questions
Answers specific to this starter and the measurements it exposes.
How is the 1.4 mm thread depth calculated?
Thread depth is radial: half the difference between the 38 mm major diameter and 35.2 mm minor diameter, giving 1.4 mm.
Are pitch and lead the same for this cap?
Yes only because the starter uses one thread start. Pitch is 3.5 mm and lead is pitch multiplied by starts, so the one-start lead is also 3.5 mm.
Does the gasket recess make the cap watertight?
No. The recess is measured geometry only. Gasket material, lip condition, compression, cap stiffness, contents, pressure and repeated use all need separate validation.
Why print clearance rings instead of the whole cap?
The rings isolate thread engagement and compare three clearances quickly. They reduce print time while keeping the real counterpart and final print setup in the experiment.
Keep exploring
Use the guide when you need the reasoning, or open another template to see the same measurement-first workflow in a different part family.
Make this starter your own
Open the real generator, replace the example dimensions and keep the calibration result tied to your printer and material.