What is Threaded Lid Generator?
Threaded Lid Generator is a free MakerWorld customizer by Shop Therapy that makes a replacement screw-on cap for a jar or bottle from your own measurements, with no Fusion or other CAD needed. It has been customized more than 14,000 times.
You measure four things on the container neck with calipers: the major diameter including the threads, the minor diameter without them, the thread pitch, and the lid height down to the ring below the threads. Enter those in the customizer, add clearance if needed and generate a cap. The author notes most caps print fine at 0.2 mm layers, while 0.16 or 0.12 mm gives cleaner threads, and a video explains each parameter.
If the first cap is tight or loose, adjust the numbers and print again. It is free with a MakerWorld account and useful for kitchen jars, paint bottles, storage containers and similar household fixes.
What you can make
- Screw-on jar lids
- Bottle caps
- Replacement container caps
How to use Threaded Lid Generator
- Measure major and minor diameter, pitch and lid height
- Open Customize and enter the values
- Generate and download the cap
- Print and test, then adjust clearance if needed
What you'll need to print it
Filament and parts that suit what you make with Threaded Lid Generator.
PETG
- Bambu Lab PETG Basic (affiliate link) Amazon
- Polymaker PETG (affiliate link) Polymaker EU: 3DJake (affiliate link)
Code gives 15% off your first order at Polymaker.
M3 heat-set inserts
M3 screws
Also handy
Digital calipers
Filament dryers and dry boxes
- SUNLU FilaDryer S4 (affiliate link) Amazon
- Polymaker PolyDryer (affiliate link) Polymaker
Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that
Threaded Lid Generator pros
- Only four measurements needed
- Clearance setting to tune the fit
- Video guide for the parameters
Threaded Lid Generator cons
- Needs calipers for a good fit
- May take a test print or two to dial in
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