2 🧩 Open the Box

The actual kit contents and packaging method may be adjusted as we improve the product. This instruction will keep consistent with the current namespace.

Newest kit contents:

Early kit contents:

2.1 Cut body pieces off the baseboard.

There might be some tar residue on the wooden pieces from laser cutting. Use a piece of wet soft tissue to clean up the board.

The functional pieces are attached to the baseboard by lightly cut tabs. Though you could pop those pieces out by hand, it’s very highly recommended that you use a knife to cut on the backside of the tabs to avoid potential damage to the middle layer, where the fiber direction is perpendicular to the surface fiber.

After taking out all the pieces from the baseboard, you are encouraged to bend and break the remaining structures on the baseboard, to understand the mechanical properties of plywood, such as anisotropic strength, elasticity, etc. That will give you confidence in later handling.

2.2 Remove pointy fibers.

Use the sanding foam to clean up any thorns on the pieces. Don’t sand too much, or it may affect the tightness between joints.

2.3 Screws

There are five different screws used in the kit. I’m coloring them differently to indicate their locations better. Not all screws are required to assemble Nybble. Not all holes on the puzzle pieces need screws. Observe the assembling animation carefully to locate them.

● A is for attaching servo arms. D (sharp tip) is for attaching servos to the frame. A and D come in each servo's accessory pouch with plastic servo arms.

● B is for attaching servo arms/circuit boards to the frame.

● C (flat tip) is for binding the thighs.

● E (always the longest) is for attaching the battery holder.

2.4 Springs

There are three different springs: F, G, H.

● The eight spring F is used for elastic connection in the thigh. There’s one spare unit.

● The hard short spring G is for the neck

● The soft short spring H is for attaching the battery holder.

2.5 Servos

We are switching to a new servo manufacturer from recent batches. Previously, MG92B was used for the four shoulder joints. MG90D was used for other joints.

The new servos are differentiated by their cable length. Shorter cables are used for the neck, tail, and four shoulder joints. Longer cables are used for head tilting and the four knee joints.

2.6 Test Stand

You can 3D print this test stand so Nybble's legs won't touch the ground during programming and testing.

OpenCat Nybble stand by gcp57Thingiverse