Screw-top jar, customizable: any size, pitch and turns to close

A two-part jar: a round body with a threaded neck and a lid that screws onto it. At the defaults it is 60 mm across and 70 mm tall with the lid on, and the lid closes in 2 turns of a 4 mm pitch thread (8 mm engaged). Set the outer diameter (45 to 80 mm), the closed height (50 to 120 mm), the pitch (3 to 5 mm), the turns to close (2 to 3, in half turns) and the wall (1.6 to 4 mm).

Customize Change it with AIFree STL, 3MF and STEP, no accountMeasured on the model

Parameters

Jar outer diametermm

Overall height, closedmm

Thread pitchmm

Turns to close

Wall thicknessmm

Sliders and downloads are free. Changes by the AI designer use credits like any design; new accounts start with free ones.

Both parts print upright with the thread axis vertical and need no supports: the thread has steep flanks, and inside the jar a 45 degree cone leads up to the 46.4 mm neck, so there is no flat ceiling to bridge. The thread clearance is fixed at 0.15 mm per flank and has not been printed yet, so make one jar before a batch. The lid is a plain cylinder with no grip ribs, and there is no seal.

Parameters

Every slider in the viewer above, with the range the model accepts. The model rebuilds valid at both ends of each range.

Parameter	Range	Default	What it changes
Jar outer diameter	45 to 80 mm	60 mm	Outer diameter of the jar body. The thread is 6 mm smaller, and the lid comes out slightly narrower than the body.
Overall height, closed	50 to 120 mm	70 mm	Height of the closed jar, from the base to the top of the lid. Only the body changes; the neck and lid keep their height.
Thread pitch	3 to 5 mm	4 mm	How far the thread rises per turn. A coarser pitch closes faster and forgives a rougher print, and makes the lid and neck taller.
Turns to close	2 to 3	2	How many turns the lid takes from the first catch to closed. More turns mean more thread engaged and a firmer lid, and a slower one to open.
Wall thickness	1.6 to 4 mm	2.4 mm	Thickness of the jar wall, the floor and the lid top. A thicker wall is stiffer but leaves less room inside and narrows the neck opening.

Proof: measured on the model

What the design must satisfy and what our CAD engine measured on the model at the default values. Only measured values are shown here; nothing on this page has been printed by us yet.

Requirement	Wanted	Measured
Jar body diameter	60 mm (the slider)	60 mm
Closed height, from the base to the top of the lid	70 mm (the slider)	70 mm
Thread length inside the lid	8 mm (2 turns x 4 mm pitch)	8 mm
Neck opening for filling and emptying	46.4 mm	46.404 mm
Material shared by the lid and the jar when closed	0 mm3 (no collision)	0 mm3

jar: valid solid, one body, 60 x 60 x 67.6 mm, fits a 256 x 256 x 256 mm printer; overhangs: 1.7% of surface would need support.
lid: valid solid, one body, 59.2 x 59.2 x 10.4 mm, fits a 256 x 256 x 256 mm printer; overhangs: 0.6% of surface would need support.
Motion: 1 moving joint swept through its range with every pose checked for collisions, no problem reported at the defaults. See the Joints tab in the viewer.

Print notes

Orientation: Both parts upright with the thread axis vertical: the jar on its base, the lid upside down on its flat top.
Supports: None
Material: PLA or PETG, the same material for both parts so the thread fits as modelled
Layer height: 0.16 mm
Hardware: None
Time and filament: About 2 h 15 min and 50 g at the default size: a rough estimate from the model's volume and surface (PLA, 15% infill, about 1 mm of walls, 0.2 mm layers), not a slicer.

The thread clearance is 0.15 mm per flank (0.124 mm measured on the model). It has not been printed yet, so print one jar at the size you want and try the lid before a batch.
Start the lid square on the neck and turn it gently. It is closed when it stops against the jar after 2 turns at the defaults.
There is no slider for the thread clearance. If the lid binds or rattles on your printer, ask the designer to change the 0.15 mm clearance.
There is no gasket or seal, so do not count on it being airtight or watertight.

How it was designed

Designed with buildcad's AI agent, checked by the buildcad team. This is the request it started from and an edited account of what it did (more on how text to CAD works).

The request
A small screw-top jar about 60 mm across and 70 mm tall with a lid that closes in 2 turns, threads printable without supports.

1
It read the size and chose the thread
The agent took 60 mm as the jar's outer diameter and 70 mm as the height with the lid on, and wrote checks for both, plus one that the closed lid does not collide with the jar. It chose a 54 mm thread, 6 mm under the body, with a 4 mm pitch, so 2 turns means 8 mm of thread engaged.
2
First build: the open pose turned too far
The first build stopped at the assembly check: the open pose turned the lid 1080 degrees, but the lid leaves the thread at 810 degrees. The agent set the open pose to the 2 turns of the slider, and the next build passed.
3
What the build measured
The jar measured 60 mm across and 70 mm tall closed, with no overlap between lid and jar. The thread check reported 8 mm engaged (2.00 turns), a flank clearance of 0.15 mm (0.124 mm measured), the lid seated at 0 degrees and free of the thread at 810 degrees. The overhang check passed, flagging 1.7% of the jar's surface and 0.6% of the lid's.
4
The slider sweep did not finish
Its automatic rebuild at every slider extreme ran out of compute time twice, the second time after it narrowed the ranges, and it said in its reply that it could not check the other sizes.
5
Our change
Rebuilding each slider extreme one at a time after the run, we found that a 1-turn lid did not build: the thread helper needs at least 2 pitches of engagement. We changed the Turns to close slider from 1 to 3 in whole turns to 2 to 3 in half turns. After the change, every slider extreme was rebuilt and checked by our team.

One run of the agent: 2 min 30 s, about $0.19 of model time at list price (claude-sonnet-5-5). We changed the code afterwards, as described in the last step.

Change it with AI

Set the sliders, then press Change it with AI: a copy goes to your designs at those sizes and the designer opens with a suggested change you can edit. Its changes use credits like any design; new accounts start with free ones.

Change it with AI Describe your own part Use it from your own AI (MCP)