A cutter

A screwdriver with a J0 bit

Some superglue

A replacement neck, more about this below





Turn off his power, and tile his head to one side, you will see a screw securing his head, undo this screw, and do the same for the other side.





After removing those, you will see and another screw connecting the neck to a servo in the body, undo that as well. At this point the neck is already completely detached from everything else, but the cables still thread through it.





There are 2 options at this point: The first step is to remove the broken neck from the body.Turn off his power, and tile his head to one side, you will see a screw securing his head, undo this screw, and do the same for the other side.After removing those, you will see and another screw connecting the neck to a servo in the body, undo that as well. At this point the neck is already completely detached from everything else, but the cables still thread through it.There are 2 options at this point:





One way would be to disconnect the cables, but there are many cables and you will need to open up the head and the body, which seems tricky.





The other way is to just cut open the neck, I feel bad destroying the part, but since the neck is already damaged, that is not really a problem. Just be careful and don't cut any wires. Another consideration is that the replacement part will also need to have an opening if you don't want to disconnect the cables, you can glue the opening shut, but it will not be as strong, but I think it is a fine trade-off not having to open the body.







After that we can finally have a clear look of the neck part, it is basically a hollow cylinder, with a tube connecting to the servo gear, with space inside for the cables.





Next we need to get a new neck, if you are familiar with any CAD software and have a 3D printer you can use, it is not too difficult to make it yourself. Just make sure to leave an opening on the cylinder so you can fit the cable later, it took me a few iterations to to get to a result that looks right to me: After that we can finally have a clear look of the neck part, it is basically a hollow cylinder, with a tube connecting to the servo gear, with space inside for the cables.







If you don't have access to a 3D printer, or don't want to model it, you can also order it from



Only thing left to do is to install the new neck, push the cables into the cylinder, at this point you can put some superglue to "complete the circle" and be careful don't get the glue on to the servo or the cables, it is not absolutely necessary to glue the opening, but it will make the head feels more secure.



After it dries, you can push it on to the gear of the body servo, there is a little indicating the correct direction. Secure it with the servo screw, and then secure the head with the other 2 screws, move the head around to make sure everything works fine.



And that is the whole process, I think the result looks pretty good. No one noticed the neck is replaced, and it has been functioning well so far!







If you don't have access to a 3D printer, or don't want to model it, you can also order it from my shapeways shop Only thing left to do is to install the new neck, push the cables into the cylinder, at this point you can put some superglue to "complete the circle" and be careful don't get the glue on to the servo or the cables, it is not absolutely necessary to glue the opening, but it will make the head feels more secure.After it dries, you can push it on to the gear of the body servo, there is a little indicating the correct direction. Secure it with the servo screw, and then secure the head with the other 2 screws, move the head around to make sure everything works fine.And that is the whole process, I think the result looks pretty good. No one noticed the neck is replaced, and it has been functioning well so far!

When I first met RoBoHoN, he has a broken neck. It is the first thing I have to fix before I can play with him. There are a few cases like mine on Twitter, so I hope this will be useful to someone out there.Here is what you will need to repair his neck: