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Link to the video: https://www.bilibili.com/video/av52876175 In addition to 3D printed parts, you will need: Strandbeest Kit x 1 hamster ball (12 cm) x 1 bearing (id 5mm od 5mm) x 2 M3 x 8mm bolt x 4 M3 nut x 4 16 teeth or 20 teeth timing belt pulley (5mm bore) x 2 60 teeth timing belt pulley x 2 320mm timing belt loop x 2 In the cover pic, the transmission is only installed on one side. However, you can install it on both sides (Just print two ball supports with long shaft instead of a long one and a short one). And the bill of materials above is enough for both side installation. A drilling hole locator (the one without a shaft) is included to assist in marking the hole locations for drilling Mouse robot printing files. For those who do not have 3D printers, these files can be given to Taobao's 3D printing service instead. Solid printing is fine. Please click the like button and save it before downloading. Do not use without permission. Additional parts: Strandbeest (Wind Power Biomimetic Beast) Kit x 1 Bearing (id 5mm od 10mm) x 2 hamster ball (12cm) x 1 (If for hamsters, recommend buying transparent as in the tutorial to ensure their visual field) M3 X 8mm screw x 4 M3 nut x 4 16 teeth or 20 teeth timing belt pulley (5mm bore) x 2 60 teeth timing belt pulley (8mm bore) x 2 320mm closed timing belt loop x 2