For this dynamo to work you will need the following: We suggest printing the gears with a low layer thickness and a relatively high infill to ensure their durability. The housing can be printed with a higher layer thickness, though the aestetics will suffer. The Transformer head is optional and can be connected to the dynamo by using acetone ([Click here to see how]( http://goo.gl/qr0TVI)). Check out the instructions to see how to put it together, and please check out our blog describing the design and prototyping of the dynamo. Autobots, roll out!Fit the small cogwheel to the dc-motor pin. Insert the dc-motor in the appropriate slot in the lower housing. Insert the rest of cogwheels as shown in the assembly (remember to attach one of the cogwheels to the axis as shown in the picture). Attach the handle to the handlebar and insert it in the upper housing. Now attach the last cogwheel to the handlebar, and drive the axis of the cogwheel through the lowest cogwheel and into the housing. Attach the upper housing to the lower housing and secure it with the screws.