Parametric Screw-On Bottle Funnel (Custom Threads, Any Size)

This is a parametric screw-on bottle top funnel for bottles.   The attached stl specifically fits 36mm wide mouth HDPE or Nalgene Reagent/Chemical Bottles from Amazon.  The funnel is 60mm high above a 14mm thread.  It has ridges around the bottle top to help screw on.  

Model Characteristics

• Screws directly onto the bottle, without wobbles or spills

• Internal spigot directs contents into bottle

• Fully parametric: funnel height, diameter, angle, wall thickness, and thread geometry

• Works with reagent bottles, lab bottles, chemical containers, water bottles, etc.

• Designed for fast, clean transfers of liquids, powders, or pellets

Parametric Customization

Open the included .f3d file in Fusion 360 and go to: Modify > Change Parameters
The parameter descriptions kind of guide you on how to make it work.  DM me if you need help.

Individual Parameters:

• Funnel height

• Funnel diameter

• Funnel angle

• Wall thickness

• Bottle Top Thread Parameters:

  • CapOutsideDiameter: Outside diameter including the threads

  • CapThreadToThreadDistance: Measure from the outermost ridge of one thread to the next

  • CapThreadCount: Number of thread starts, usually 1-3

  • CapInsideHeight: How deep (tall) should the cap be

  • CapHole: Diameter of the inside of the funnel in the cap

Print Details

• Pictured print: Clear Polymaker PolyLite PC

• Layer height: 0.25 mm

• Infill: 0%

• Printbed: PEI coated in AquaNet

• Supports: None required (I added 3 organic supports, but they’re optional)

• Print time: ~2 hours on a Prusa MK4S

• Dynamic Overhang Speeds (keep the threads clean):

  • 

The last version I posted, I inadvertently mirrored the model instead of rotating it, and it messed up the threads. 🤦