Caps and necks for PCO18XX standard plastic beverage bottles, SPI bottles and jars, and mason jars.

To use, add the following lines to the beginning of your file:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>

1. Section: PCO-1810 Bottle Threading

   • pco1810_neck() – Creates a neck for a PCO1810 standard bottle. ^[Geom]
   • pco1810_cap() – Creates a cap for a PCO1810 standard bottle. ^[Geom]

2. Section: PCO-1881 Bottle Threading

   • pco1881_neck() – Creates a neck for a PCO1881 standard bottle. ^[Geom]
   • pco1881_cap() – Creates a cap for a PCO1881 standard bottle. ^[Geom]

3. Section: Generic Bottle Connectors

   • generic_bottle_neck() – Creates a generic neck for a bottle. ^[Geom]
   • generic_bottle_cap() – Creates a generic cap for a bottle. ^[Geom]
   • bottle_adapter_neck_to_cap() – Creates a generic adapter between a neck and a cap. ^[Geom]
   • bottle_adapter_cap_to_cap() – Creates a generic adaptor between a cap and a cap. ^[Geom]
   • bottle_adapter_neck_to_neck() – Creates a generic adaptor between a neck and a neck. ^[Geom]

4. Section: SPI Bottle Threading

   • sp_neck() – Creates an SPI threaded bottle neck. ^[Geom]
   • sp_cap() – Creates an SPI threaded bottle cap. ^[Geom]
   • sp_diameter() – Returns the base diameter of an SPI bottle neck from the nominal diameter and type number.

5. Section: Mason Jar Threading

   • mason_neck() – Creates a threaded glass mason jar neck. ^[Geom]
   • mason_cap() – Creates a threaded mason jar cap. ^[Geom]

The PCO (Plastic Closure Only) 1810 is a bottle neck standard for water and drink bottles typically ranging from 250 ml to 2 L. PCO1810 is the original specification, using a 21 mm thread height, 810° thread travel, and 3.18 mm thread pitch. An updated standard PCO1881 uses a shorter neck and thinner threads to save material.

Synopsis: Creates a neck for a PCO1810 standard bottle. ^[Geom]

Topics: Bottles, Threading

See Also: pco1810_cap()

Usage:

• pco1810_neck([wall]) [ATTACHMENTS];

Description:

Creates an approximation of a standard PCO-1810 threaded beverage bottle neck.

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1810_neck();

Example 2: Standard anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1810_neck() show_anchors(custom=false);

Example 3: Custom named anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
expose_anchors(0.3)
 pco1810_neck()
 show_anchors(std=false);

Synopsis: Creates a cap for a PCO1810 standard bottle. ^[Geom]

Topics: Bottles, Threading

See Also: pco1810_neck()

Usage:

• pco1810_cap([h], [r|d], [wall], [texture]) [ATTACHMENTS];

Description:

Creates a basic cap for a PCO1810 threaded beverage bottle.

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1810_cap();

Example 2: PCO1810 caps with different texture options. Clockwise from top: knurled, sharp_knurled, ribbed, sharp_ribbed. Center: hex_faces. All textures increase the overall diameter of the part to preserve the original wall thickness.

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
back(36) pco1810_cap(texture="knurled");
right(36) pco1810_cap(texture="sharp_knurled");
fwd(36) pco1810_cap(texture="ribbed");
left(36) pco1810_cap(texture="sharp_ribbed");
pco1810_cap(texture="hex_faces");

Example 3: Standard anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1810_cap(texture="ribbed") show_anchors(custom=false);

Example 4: Custom named anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
expose_anchors(0.3)
 pco1810_cap(texture="knurled")
 show_anchors(std=false);

The PCO (Plastic Closure Only) 1881 standard is an update to the PCO1810. Both are used for plastic water and drink bottles typically ranging from 250 ml to 2 L. Both standards have a neck diameter of 28 mm. Because the neck and cap account for a large fraction of the total material used in a plastic bottle, the PCO1881 standard was developed to reduce material compared to the PCO1810 standard by using a shorter neck (17 mm thread height) and thinner threads (650° thread travel with 2.7 mm pitch).

Synopsis: Creates a neck for a PCO1881 standard bottle. ^[Geom]

Topics: Bottles, Threading

See Also: pco1881_cap()

Usage:

• pco1881_neck([wall]) [ATTACHMENTS];

Description:

Creates an approximation of a standard PCO-1881 threaded beverage bottle neck.

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1881_neck();

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1881_neck() show_anchors(custom=false);

Example 3:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
expose_anchors(0.3)
 pco1881_neck()
 show_anchors(std=false);

Synopsis: Creates a cap for a PCO1881 standard bottle. ^[Geom]

Topics: Bottles, Threading

See Also: pco1881_neck()

Usage:

• pco1881_cap(wall, [texture]) [ATTACHMENTS];

Description:

Creates a basic cap for a PCO1881 threaded beverage bottle.

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1881_cap();

Example 2: PCO1881 caps with different texture options. Clockwise from top: knurled, sharp_knurled, ribbed, sharp_ribbed. Center: hex_faces. All textures increase the overall diameter to preserve the original wall thickness.

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
back(36) pco1881_cap(texture="knurled");
right(36) pco1881_cap(texture="sharp_knurled");
fwd(36) pco1881_cap(texture="ribbed");
left(36) pco1881_cap(texture="sharp_ribbed");
pco1881_cap(texture="hex_faces");

Example 3: Standard anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
pco1881_cap(texture="ribbed") show_anchors(custom=false);

Example 4: Custom named anchors

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
expose_anchors(0.5)
 pco1881_cap(texture="ribbed")
 show_anchors(std=false);

All of these connectors default to the PCO1881 standard, if applicable, for arguments that are left blank.

Synopsis: Creates a generic neck for a bottle. ^[Geom]

Topics: Bottles, Threading

See Also: generic_bottle_cap()

Usage:

• generic_bottle_neck([wall], ...) [ATTACHMENTS];

Description:

Creates a bottle neck given specifications.

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
generic_bottle_neck();

Synopsis: Creates a generic cap for a bottle. ^[Geom]

Topics: Bottles, Threading

See Also: generic_bottle_neck(), sp_cap()

Usage:

• generic_bottle_cap(wall, [texture], ...) [ATTACHMENTS];

Description:

Creates a basic threaded cap given specifications. You must give exactly two of thread_od, neck_od and thread_depth to specify the thread geometry. Most glass bottles conform to the SPI standard and caps for them may be more easily produced using sp_cap().

Arguments:

Named Anchors:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
generic_bottle_cap(thread_depth=2,neck_od=INCH,height=INCH/2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
generic_bottle_cap(texture="knurled",neck_od=25,thread_od=30,height=10);

Example 3:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
generic_bottle_cap(texture="ribbed",thread_depth=3,thread_od=25,height=13);

Synopsis: Creates a generic adapter between a neck and a cap. ^[Geom]

Topics: Bottles, Threading

See Also: bottle_adapter_neck_to_neck()

Usage:

• bottle_adapter_neck_to_cap(wall, [texture], ...) [ATTACHMENTS];

Description:

Creates a threaded neck to cap adapter

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
bottle_adapter_neck_to_cap();

Synopsis: Creates a generic adaptor between a cap and a cap. ^[Geom]

Topics: Bottles, Threading

See Also: bottle_adapter_neck_to_cap(), bottle_adapter_neck_to_neck()

Usage:

• bottle_adapter_cap_to_cap(wall, [texture]) [ATTACHMENTS];

Description:

Creates a threaded cap to cap adapter.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
bottle_adapter_cap_to_cap();

Synopsis: Creates a generic adaptor between a neck and a neck. ^[Geom]

Topics: Bottles, Threading

See Also: bottle_adapter_neck_to_cap(), bottle_adapter_cap_to_cap()

Usage:

• bottle_adapter_neck_to_neck(...) [ATTACHMENTS];

Description:

Creates a threaded neck to neck adapter.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
bottle_adapter_neck_to_neck();

Synopsis: Creates an SPI threaded bottle neck. ^[Geom]

Topics: Bottles, Threading

See Also: sp_cap()

Usage:

• sp_neck(diam, type, wall|id=, [style=], [bead=]) [ATTACHMENTS];

Description:

Make a SPI (Society of Plastics Industry) threaded bottle or jar neck. You must supply the nominal outer diameter of the threads and the thread type, one of 400, 410 and 415. The 400 type neck has 360° of thread, the 410 neck has 540° of thread, and the 415 neck has 720° of thread. You can also choose between the symmetric L style thread and the asymmetric M style buttress thread. The M style may be good for 3d printing if printed with the flat face up. You can specify the wall thickness (measured from the base of the threads) or the inner diameter, and you can specify an optional bead at the base of the threads.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(48,400,2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(48,400,2,bead=true);

Example 3:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(22,410,2);

Example 4:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(22,410,2,bead=true);

Example 5:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(28,415,id=20,style="M");

Example 6:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_neck(13,415,wall=1,style="M",bead=true);

Synopsis: Creates an SPI threaded bottle cap. ^[Geom]

Topics: Bottles, Threading

See Also: sp_neck()

Usage:

• sp_cap(diam, type, wall, [style=], [top_adj=], [bot_adj=], [texture=], [$slop]) [ATTACHMENTS];

Description:

Make a SPI (Society of Plastics Industry) threaded bottle or jar cap. You must supply the nominal outer diameter of the threads and the thread type, one of 400, 410 and 415. The 400 type neck has 360° of thread, the 410 neck has 540° of thread, and the 415 neck has 720° of thread. You can also choose between the symmetric L style thread and the asymmetric M style buttress thread. It is OK to mix styles, so you can put an L-style cap onto an M-style neck.

The 410 and 415 caps have long unthreaded sections at the bottom. The bot_adj parameter specifies an amount to reduce that bottom extension, which might be necessary if the cap bottoms out on the bead. Be careful that you don't shrink past the threads, especially if making adjustments to 400 caps that have a small bottom extension. These caps often contain a cardboard or foam sealer disk, which can be as much as 1mm thick, and would cause the cap to stop in a higher position.

You can also adjust the space between the top of the cap and the threads using top_adj. This changes how the threads engage when the cap is fully seated.

The inner diameter of the cap is set to allow 10% of the thread depth in clearance. The diameter is further increased by 2 * $slop so you can increase clearance if necessary.

Note: there is a published SPI standard for necks, but absolutely nothing for caps. This cap module was designed based on the neck standard to mate reasonably well, but if you find ways that it does the wrong thing, file a report.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_cap(48,400,2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_cap(22,400,2);

Example 3:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_cap(22,410,2);

Example 4:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
sp_cap(28,415,1.5,style="M");

Synopsis: Returns the base diameter of an SPI bottle neck from the nominal diameter and type number.

Topics: Bottles, Threading

See Also: sp_neck(), sp_cap()

Usage:

• true_diam = sp_diameter(diam,type)

Description:

Returns the actual base diameter (root of the threads) for a SPI plastic bottle neck given the nominal diameter and type number (400, 410, 415).

Arguments:

The Mason jar is a glass container with a threaded neck and two-piece metal lid consisting of a sealing disk and a threaded retaining ring. It has been widely used in North America since it was patented in 1858 by American tinsmith John Landis Mason. Brands like Ball and Kerr established the two dominant thread geometries still in use today: 70-450G (standard glass Mason jar with 70 mm outer thread diameter) and 86-400 (wide mouth Mason jar with 86 mm outer thread diameter). The 450G designation has a taller thread engagement area compared to the 400 series. One may also run across a 70-400 thread finish designed for plastic caps (different from the SPI 70-400), and the 89-400 finish used by some international suppliers.

The Glass Packaging Institute (GPI) maintains standards and drawings for Mason jar threads, but does not make them publicly available. The specs used in these modules were derived from various online sources and physical measurements.

Synopsis: Creates a threaded glass mason jar neck. ^[Geom]

Topics: Bottles, Threading

See Also: mason_cap()

Usage:

• mason_neck(diam, type, wall|id=, [style=], [bead=]) [ATTACHMENTS];

Description:

Make a threaded Mason jar neck. You must supply the nominal outer diameter of the threads and the thread type, 400 or 450. The 400 type neck is generated with 370° of thread, and the 450 neck has 460° of thread (slightly more than 1.25 turns). You can also choose between the symmetric L style thread and the asymmetric M style buttress thread. The M style may be good for 3d printing if printed with the flat face up. You can specify the wall thickness (measured from the base of the threads) or the inner diameter, and you can specify an optional bead at the base of the threads.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_neck(70,400,2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_neck(70,450,2,bead=true);

Example 3:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_neck(86,400,2);

Example 4:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_neck(89,400,2,style="M",bead=true);

Synopsis: Creates a threaded mason jar cap. ^[Geom]

Topics: Bottles, Threading

See Also: mason_neck()

Usage:

• mason_cap(diam, type, wall, [style=], [top_adj=], [bot_adj=], [texture=], [$slop]) [ATTACHMENTS];

Description:

Make a GPI (Glass Packaging Institute) threaded mason jar cap. You must supply the nominal outer diameter of the threads and the thread type, 400 or 450. While the 400 type neck has 370° of thread, and the 450 neck has 460° of thread, the cap thread is increased by 1.35 times these amounts. You can also choose between the symmetric L style thread and the asymmetric M style buttress thread. The M style may be good for 3d printing if printed with the flat face up. It is OK to mix styles, so you can put an L-style cap onto an M-style neck.

The bot_adj parameter specifies an amount to reduce that bottom extension, which might be necessary if the cap bottoms out on the bead. Be careful that you don't shrink past the threads, especially if making adjustments to type 400 caps that have a small bottom extension. These caps often contain a cardboard or foam sealer disk, which can be as much as 1mm thick, and would cause the cap to stop in a higher position.

You can also adjust the space between the top of the cap and the threads using top_adj. This changes how the threads engage when the cap is fully seated.

The inner diameter of the cap is set to allow 10% of the thread depth in clearance. The diameter is further increased by 2 * $slop so you can increase clearance if necessary.

Arguments:

Example 1:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_cap(70,450,2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/bottlecaps.scad>
mason_cap(86,400,2);