A freshly painted hull is exactly the wrong thing to balance on two paint pots while you fit railings. That is the everyday problem behind the question, what is a berth jig? It is a purpose-built support that holds a scale ship model safely at the bench, giving you stable access to the hull, deck edges and fine detail without repeatedly picking the model up.
For ship modellers, it can be one of those deceptively simple tools that changes how comfortably a build progresses. Rather than treating the model like a fragile object that must be moved out of the way between every task, a berth jig gives it a secure place to sit while the work continues around it.
What Is a Berth Jig Used For?
A berth jig is essentially a miniature dry berth for a model ship. It supports the hull from below, usually along or close to the keel, with adjustable side supports to prevent it rolling or shifting. The model rests in the jig rather than being gripped tightly, which is an important distinction when dealing with thin plastic, resin hulls, photo-etch and delicate painted surfaces.
Its main job is to keep the ship level, steady and protected while you build, paint, weather or add fittings. It is particularly useful once a hull has acquired details that make it awkward to lay on its side: propeller shafts, rudders, sonar domes, railings, rigging, masts or a carefully finished waterline.
A good jig also creates clearance beneath the model. That makes it easier to work around the lower hull and stern without the ship rubbing directly against the cutting mat or bench. It also reduces the chances of a small fitting catching on a loose tool, sanding stick or stray blob of adhesive.
Why a Ship Model Needs More Than a Makeshift Stand
Improvised supports work until they do not. Foam blocks can shed bits, mark fresh paint or compress unevenly. Paint jars and offcuts vary in height. A towel may stop scratches, but it does nothing to stop a hull moving when you apply pressure to a deck fitting.
A berth jig brings repeatability. You can return the model to the same position each session, keep it level for painting and work with both hands free. That matters when placing a run of photo-etch railings, lining up a deck section, drilling a mast hole or fitting a tiny boat davit that has already made three attempts to escape into the carpet.
The benefit is not simply that the ship is held still. It is that your handling becomes more deliberate. Less lifting means fewer fingerprints on satin paint, fewer knocked aerials and less strain on joints that have not fully cured. For larger models, a jig also gives you a safer way to turn the hull around on the bench without using the superstructure as a handhold.
How a Berth Jig Supports the Model
Most berth jigs use a long base with movable upright supports. The supports are adjusted to suit the width and shape of the hull, then positioned so they contact strong, sensible areas rather than vulnerable details. Depending on the design, the hull may sit on a centreline cradle, keel blocks or padded contact points, with side pieces preventing sideways movement.
The goal is stable support, not clamping force. The model should not be squeezed between the uprights. If a hull flexes, sits under tension or needs force to fit, the jig is set too tightly or the support positions are wrong.
For many full-hull naval and merchant ship kits, the keel or lower hull provides a natural central reference. A waterline model needs a slightly different approach because it has no deep lower hull to settle into. In that case, broad, evenly spaced supports are useful for keeping the flat underside level without damaging the hull sides.
Shape matters as much as scale. Two 1:350 ships may have very different beam, hull flare and stern form. An adjustable berth jig is valuable because it can be set to the individual model instead of expecting every hull to conform to one fixed cradle.
Set the supports where the hull is strongest
Place support points away from etched railings, anchor chains, protruding bilge keels and fine hull detail. Look for solid areas around the lower hull and choose more than one point of support so the weight is distributed. On a long hull, supports placed too close together can leave the bow or stern feeling springy.
If the model has a glossy or freshly painted finish, consider a soft, clean barrier at the contact points. Use only enough material to protect the surface. Too much padding can make a ship less stable, especially if it allows the hull to settle unevenly.
Keep it level when accuracy matters
Level support is especially useful for waterline masking, applying boot topping, fitting decks and checking the sit of major assemblies. A model that leans slightly in its stand may not look like a problem until a painted line or long railing run makes the angle obvious.
A jig will not correct a warped hull or a misaligned deck, but it gives you a consistent reference while you inspect and correct those issues. That is far better than trying to judge level by eye while holding the model in one hand.
When to Put a Model in a Berth Jig
The best time is earlier than many modellers expect. Once the main hull is assembled and structurally sound, a jig can become its regular parking place. It is useful during hull preparation and painting, then remains useful as the build becomes more fragile.
There are a few moments where it earns its bench space. During sanding and filling, it stops the hull skating around. During painting, it keeps fingers clear of the finish. During deck detailing, it supports the model while you apply gentle pressure. During rigging, it gives the ship a stable base while you handle fine line and tension it carefully.
That said, a berth jig is not always the right answer. If you need to work directly on the underside, it may need repositioning or removal. A very small patrol boat or simple waterline kit might be perfectly manageable on a modest foam support. Conversely, a long battleship, liner or modern warship with an increasingly busy deck benefits greatly from a dedicated berth.
Choosing the Right Berth Jig for Your Build
Start with the model’s overall length, beam and hull type. The jig needs enough base length to support the ship sensibly, and enough adjustment to accommodate its width without placing the uprights at an awkward angle. Buying solely by scale can be misleading: a 1:700 aircraft carrier and a 1:700 destroyer make very different demands on a holder.
Think about the work you actually do at the bench. If you build several eras and scales, adjustability is more useful than a fixed-size stand. If you mainly build similar subjects, a simpler jig may suit you well. Also consider the height of the model in the cradle. A very tall stand can make deck work less comfortable, while one that is too low may leave masts and superstructure dangerously close to the bench.
Material matters, but not in the way it might for a display stand. A practical jig should be stiff enough not to twist, smooth where it contacts the model and easy to adjust without fuss. For a 3D-printed jig, clean design and sensible support geometry are more useful than decorative features. This is a bench tool first.
At The 3D Forge, that principle comes from the workbench rather than a boardroom: tools for modellers designed by a modeller. Naturally, the Forge Cat gives the final quality inspection before anything is deemed fit for duty.
Using a Berth Jig Without Damaging Your Ship
Before setting the model down, clear loose parts, blades and abrasive dust from the jig. Even a tiny sanding fragment trapped under a hull can leave a mark in a vulnerable finish. Adjust the supports with the model nearby, then lower it in gently and check that it is sitting naturally rather than rocking.
Do not use the jig as a vice. If you need to apply firm pressure while drilling or sanding, support the area from beneath where possible and keep that pressure controlled. A jig stops the whole model moving, but it cannot stop thin plastic from flexing if force is concentrated in the wrong place.
It is also worth treating the berth as part of your bench organisation. Give it a clear, stable place away from the edge of the desk and away from where sleeves, airbrush hoses and power leads pass. A supported model is safer, but only if the support itself is not one elbow away from disaster.
A berth jig will not build the ship for you, straighten every photo-etch part or prevent the occasional carpet monster incident. What it does provide is a calm, dependable place for a fragile project to live while you work. Once a hull has a proper berth on the bench, balancing it on whatever happens to be nearby quickly starts to feel like a habit worth leaving behind.