Print Profile(1)
Bill of Materials
Description
Adjustable 1/2" NPT Sprinkler Riser / NPT Conduit Extension (46–250 mm)
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This parametric sprinkler extension was engineered to outperform cheap retail risers that frequently crack and break. The design is simple to print, customizable, and immediately useful to a large number of homeowners and makers.
Boosting this post will help more users discover a reliable fix for a very common problem.
Description
Fully parametric 1/2" NPT sprinkler / NPT conduit extension designed for irrigation / electrical systems requiring adjustable and precise height adjustments.
The model supports customizable lengths from 46 mm to 250 mm, allowing exact alignment of sprinkler heads without purchasing multiple factory risers.
Tested and accurate tapered NPT male and female threads, modeled at the proper 1:16 taper and optimized for 3D printing. Outdoor durability is maximized when printed using fully dried ASA.
Key Features
- Accurate 1/2" NPT tapered threads (male + female)
- Fully parametric Fusion 360 model
- Includes parametric Length and Thread Tolerance for alternate Filaments
- Adjustable extension length: 46–250 mm
- Printed threads tested for leak-resistant sealing
- Hex base for tightening
- Smooth threads for teflon tape
Recommended Print Settings
- Material: ASA (preferred for sun & weather resistance)
- Orientation: Print vertically add brim as needed
Customized Parametric Model Settings in Bambu Studio
The MakerWorld Parametric Model Make only exports a few of the slicer settings. When opening a customized parametric model, ensure the slicer settings match the published .3mf file settings:
- Quality
- Layer Height .2
Seam Position: Nearest
- Strength
- Wall Loops: 8
- Top & Bottom Surface Pattern: Concentric
- Top & Bottom Shell Layers: 7
- Internal solid infill patterns: Archimedean Chords
- Sparse infill density 15%
Sparse infill pattern: Gyroid
- Speed
- Outer wall: 40 mm/s
- Inner wall: 150 mm/s
- Sparse infill:L 100 mm/s
Material Offset Guide (3D Printing)
When setting the Tolerance level in the Parametric Model use these offsets to adjust threads. The smaller (negative) the Tolerance then tighter fit the threads will have.
| Material | Internal Offset (mm) | External Offset (mm) | Notes |
| PLA | +0.10 to +0.20 | −0.10 to −0.20 | Minimal shrink; good dimensional stability |
| PETG | +0.15 to +0.25 | −0.15 to −0.25 | Slight swelling; add clearance |
| ASA | +0.20 to +0.30 | −0.20 to −0.30 | Shrink + warp; needs max compensation |
Notes
- Apply Teflon tape for best seal performance.
- Ensure length selected fits within printer build volume.
- Threads tested on standard U.S. irrigation fittings.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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