GasketDXF Generator
Menu

1:1 gasket CAD · ASME / EN library · photo tracer · mm / in

3D Print TPU Gasket Generator

Thickness, bead and mold come first here: the 3D viewport shows the exact TPU part the STL will contain, and one toggle swaps it for the two-part silicone casting mold.

Worked
examples

View A · 2D blueprint

Min web—SAFE—
PROOF ONLY — NOT 1:1 SCALE
OUTER_CUTINNER_BOREBOLT_HOLESCENTERLINESweb < 2.5 mm
Outer × inner
—
Bolt pattern
—
Bolt chord S
—
Ligament S − d
—
Hole → bore
—
Hole → outer edge
—
Area
—
Weight
—
Cut outer (+kerf)
—
Cut bore (−kerf)
—
Cut bolt hole
—

    View B · 3D extrusion

    drag to orbit · wheel to zoom
    Hole coordinates · polar & XY from the centre
    HoleAngleRadiusXY

    Export

    this exact gasket
    Free screen proof · not to scale
    Pro 1:1 production files
    Early Launch Price

    How to

    Print a seal, or cast one

    1. Load or draw the outlinePick an example, design any of the 5 shapes or trace a photo.
    2. Set t and the bead0.5–10 mm thickness; bead 0.3 × 1.2 mm on both faces where it fits.
    3. Check the 3D partOrbit the part; toggle Silicone mold to see the base, pins and lid.
    4. Export the STL packgasket_tpu_part.stl and silicone_casting_mold.stl, ready for your slicer.

    Print settings

    TPU 95A settings that seal

    Starting values for a 0.4 mm nozzle; fine-tune flow on a test square.

    SettingValueWhy
    Nozzle temperature220–235 °CTPU 95A; go hotter for better layer bonding on thick seals
    Bed temperature40–60 °CPEI or textured sheet; glue stick on smooth glass
    Print speed20–35 mm/sDirect drive preferred; Bowden needs the slow end
    Walls / perimeters3–4Thick walls keep the bead and hole edges solid
    Infill100 %A seal must not have voids; use concentric or rectilinear
    Flow / extrusion multiplier100–105 %Tune on a 20 mm test square until it measures true

    When TPU seals — and when it does not

    Good: garden and pump water, compressed air, grease, gearbox oil, enclosure lids, up to about 80 °C. Not good: exhaust, cylinder heads, steam, brake fluid, petrol immersion. For those, cut aramid fibre, FKM or copper on the laser and Cricut kerf guide settings, or cast silicone.

    Sealing bead

    What the 0.3 mm bead does

    t bead 1.2 mm wide 0.3 mm high bolt-hole sidebore side Clamp load concentrates on the bead line and it seals before the flat face.
    Bead cross-section: 1.2 mm wide, 0.3 mm high half-ellipse on both faces, centred between the bore and the bolt holes.

    The bead centreline runs halfway across the clear web between the bore and the bolt holes. On the 90 mm pump seal it is a 57.7 mm circle; the part is 2.6 mm tall over the beads. A bead is left out wherever it would come within 0.8 mm of an edge, and the 3D note says so.

    Casting

    Casting RTV silicone in the two-part mold

    1. Print both partsPLA or PETG, 0.2 mm layers, the cavity face up.
    2. Release and closeWipe the cavity with release agent; drop the lid on the four pins without flipping it.
    3. PourMix two-part RTV, pour slowly into the Ø6 sprue until it shows in both Ø2 vents.
    4. Cure and openFollow the silicone's cure time, then lift the lid and peel the gasket.

    Bed check: the block is the gasket box + 12 mm per side. The IP box seal (120 × 80 mm) makes a 144 × 104 × 7 mm block; the ASME 4-inch flange makes 252.6 × 272.6 × 7.0 mm and no longer fits a 256 mm bed. Bolt hole math is on the bolt circle calculator page.

    Use cases

    Seals people print

    FAQ

    Questions from the shop floor

    Short, specific answers. Open a question to read it.

    Will a TPU 95A gasket seal?

    Yes for water, air, grease and oil up to about 80 °C, where TPU stays elastic. Print it solid at 100 % infill and keep the bead on. It is not for exhaust, cylinder heads, steam or fuel immersion — TPU softens above about 80 °C and swells in petrol.

    What does the sealing bead do?

    The bead is a 0.3 mm high, 1.2 mm wide half-ellipse ridge on both faces, running between the bore and the bolt holes. Clamp load concentrates on that thin line first, so it seals uneven or slightly warped faces before the flat area touches. It adds about 0.12 g to a 90 mm pump seal.

    Why is there a mold in the STL pack?

    For temperatures or fluids TPU cannot take, print the two-part mold in PLA or PETG and cast high-temperature RTV silicone. The base has a gasket-shaped cavity of your thickness, cores for every hole, four Ø5 locating pins and bead grooves; the 4 mm lid has a Ø6 pour sprue and two Ø2 vents.

    Does the mold fit my printer?

    The block is the gasket box plus 12 mm on every side and t + 4 mm tall; the Pro card says whether it fits a 256 × 256 mm bed. The 90 mm pump seal makes a 114 × 114 × 6 mm block, which fits; large flanges usually do not, and then the paper template or a split ring is the better route.

    Is the triangle count real?

    Yes. The number on the Pro card is the triangle count of the gasket_tpu_part.stl that would be written for the current design — circles are tessellated at 0.05 mm chord error with at least 48 segments — and it changes with the bolt count, thickness and bead.

    Which slicer settings matter most?

    100 % infill, 3–4 walls and a flow that makes a 20 mm test square measure 20.0 mm. Slow down to 20–35 mm/s and print the first layer slowly so holes stay round. The table above has the full starting set.

    The gasket family

    Same engine, a page for each job

    Every tool page opens the same studio with its own examples; the guides explain the numbers.