Brachiosaurus MOC Build Guide: 560 Pieces, 2 Hours
The short version: this brachiosaurus MOC uses roughly 560 pieces, stands 14 cm tall, measures about 32 cm from chest to tail tip, and takes around two hours to build. Difficulty sits at easy-to-medium. Build in the order torso, then legs, then neck and tail, and the long neck will not sag and the tail will not snap off — even on a first attempt. The full instructions are free to download at brickplan.cn.
Brachiosaurus is one of the most recognisable Jurassic dinosaurs, and its long neck lets it browse the treetops without competing with smaller plant-eaters. Recreating that silhouette in bricks is not hard because of the piece count; it is hard because the neck and tail have to stay thin and long while still holding together. This guide breaks down each critical joint so you can follow along.
Step 1: Build the torso frame
Start with a 6x14 plate as the main body line. Add two rows of 2x4 bricks at both the front and the back to raise them, creating the step between the chest and the pelvis. Leave a two-stud gap in the middle of the torso — that gap is where the cross-axle hole pieces for the legs will sit.
Remember that the torso carries the centre of gravity for the whole model. Front and rear weight need to be balanced, or the finished brachiosaurus will not stand.
Step 2: Legs and feet
A brachiosaurus has longer front legs than rear legs, and that is the source of its high-shouldered, low-hipped stance. Build the front legs from four 1x2 Technic bricks with holes, stacked six layers high; build the rear legs five layers high. At the knee, use a 1x1 hinge piece to set a slight bend.
Give every foot a 2x3 plate sole with added grip studs. Once all four legs are pushed into the torso's axle holes, do not rush to cap the body — first check that all four feet sit flat on the same plane, then continue.
Step 3: How to keep the long neck upright
The neck is where a brachiosaurus MOC most often develops a droop. The trick is a technic axle running through the interior all the way down into the torso. Start at the axle hole at the front of the body and extend it with three 8L technic axles joined by two axle connectors. Wrap every two layers with a ring of 1x2 Technic bricks with holes to form the vertebrae, then use 1x1 slope bricks to shape the forward curve.
Built this way, the neck comes out about 18 cm long, rises naturally to roughly 45 degrees, and holds its position instead of collapsing.
Step 4: The long tail and finishing touches
The tail steps down using 1x2 Technic bricks with holes, each layer one stud narrower than the one below it, which produces a natural taper. Fit hinge pieces into the three layers closest to the hips so the tail can swing about 20 degrees side to side and give the model a lighter, more dynamic look.
Finish with a 2x2 round plate for the head, 1x1 round plates for the eyes, and a few dark green bricks scattered along the body to suggest skin texture. That completes the build.
FAQ
Q: How do I make the brachiosaurus MOC's neck stable?
A: The key is a technic axle running through the neck's interior and anchored into the torso as a spine. Wrap it layer by layer in Technic bricks with holes, lock each ring tight, and interlock the neck with the torso frame every few layers. The neck then will not sway forward and back or droop.
Q: How many pieces does it need?
A: About 560. That breaks down to roughly 120 2x4 bricks, about 150 1x2 Technic bricks with holes, around 20 technic axles, 8 hinge pieces, and the rest plates, slopes and decorative parts. A normal basic-brick collection will usually cover it.
Q: Is it suitable for beginners?
A: Yes. Overall difficulty is easy-to-medium. The only genuinely fiddly part is threading the axles through the neck, but if you follow the order given in Step 3 and check your work against the instructions on brickplan.cn, a first-time builder can finish it in two hours.
Q: Why does my brachiosaurus keep falling over?
A: It is almost always uneven front-to-back weight in the torso, or legs that are not fully seated in the axle holes. Try adding one layer to the front legs and removing one from the rear, and make sure all four feet touch the same flat surface before you lock anything down.
Q: Can I substitute other brands of bricks?
A: Yes. Every part in this MOC is a standard studded brick, so it interlocks with mainstream brands as long as the stud dimensions match, and the part numbers in the instructions map onto common generic parts.