Underwater connectors

3-pin connector

STL files

Pict	Part name	Best mat	Qty	Notes
	3pin_penetrator	PETG	1	This part differs from the 4-pin penetrator. Use it only for making a 3-pin connector
	3pin_penet_inner	PETG	1	This part differs from the 4-pin penetrator. Use it only for making a 3-pin connector
	Penet_nut	PETG	1	Same as 4-pin version
	Penet_tip	PETG	1	Same as 4-pin version
	Plug_grip	PETG	1	Same as 4-pin version
	3pin_plug_inner	PETG	1	This part differs from the 4-pin plug. Use it only for making a 3-pin connector
	Plug_tip	PETG	1	Same as 4-pin version
	Plug_cap	PETG	1	Same as 4-pin version

3-pin connector terminals

There are a bunch of similar terminals with different sizes out there. For the best fit with the printed parts, we need those with dimensions as close as possible to those pictured below.

Exact model: Female Pins and Male Pins (Housing is not needed)

4-pin connector

STL files

Pict	Part name	Best mat	Qty	Notes
	4pin_penetrator	PETG	1	This part differs from the 3-pin penetrator. Use it only for making a 4-pin connector
	4pin_penet_inner	PETG	1	This part differs from the 3-pin version. Use it only for making a 4-pin connector
	Penet_nut	PETG	1	Same as 3-pin version
	Penet_tip	PETG	1	Same as 3-pin version
	Plug_grip	PETG	1	Same as 3-pin version
	Plug_tip	PETG	1	Same as 3-pin version
	Plug_cap	PETG	1	Same as 3-pin version
	4pin_plug_inner	PETG	1	This part differs from the 3-pin version. Use it only for making a 4-pin connector

4-pin connector terminals

Exact model: male and female

Penetrator blinders

STL files

Pict	Part name	Best mat	Qty	Notes
	Penet_blinder	PETG	1

Plug blinders

Plug blinders are used when some connectors are not connected. They are as watertight as the connectors. They can also be used to protect penetrators from dust when not in use.

STL files

Pict	Part name	Best mat	Qty	Notes
	Plug_tip_blind	PETG	1	Same for 3- or 4-pin plug blinder
	4pin_plug_inner_blind	PETG	1
	Plug_grip	PETG	1	Same for 3- or 4-pin version

Plug connector guard

Prevents the plug from getting wet or dusty (when disconnected from the craft).

Pict	Part name	Best mat	Qty	Notes
	Plug_guard	PETG	1	Same for 3- or 4-pin plug

Build help 3D files

These files are helpful for consistently producing connectors.

Pict	Part name	Best mat	Qty	Notes
	3pin_fixture	PETG	1
	4pin_fixture	PETG	1

O-ring for penetrator (female) connector

Exact model: OD16mm CS2mm or OD18mm CS3mm (inner diameter is always 12mm), 60-70 ShA (ShA no less, no more)

O-ring for male plug connector

Exact model: OD11mm CS2mm or OD13mm CS3mm (inner diameter is always 7mm) 60-70 ShA (ShA no less, no more)

Spade connector terminals

Exact model: 2.8mm male, 2.8mm female, isolator

JST connectors with wire

Exact model:

• 2 PIN, XH 2.54 mm, 20-30cm, at least 10 sets; more is better
• 3 PIN, XH 2.54 mm, 20-30cm, at least 10 sets; more is better
• 4 PIN, XH 2.54 mm, 20-30cm, at least 10 sets; more is better

JST connector set

JST, connector terminal, spade crimping pliers

Exact model: SN-68B

Your life will be dramatically easier with these pliers. A must-have for every toolbox!

Wires

For motors, use high-amperage wires. Avoid wires with silicone insulation (typical drone motor wires), as silicone cannot be bonded with epoxy — this usually results in connector leakage.