The torque is staggering! There are a bunch of 5:1 ratios at the beginning, a bunch of 24:1 and 40:1 ratios in the middle, and several single-sided helical gears with a 5:3 ratio. Multiplying all the numbers together: Gearbox 15 yuan, yellow combination 144-tooth large gear set of 8 16 yuan, 56-tooth turntable gear 25 yuan, 40-tooth large gear 5 yuan, 24-tooth medium gear 2.4 yuan, 8-tooth small gear 1 yuan, 36-tooth double-sided helical gear 10 yuan, 20-tooth single-sided helical gear 2 yuan, 12-tooth single-sided helical gear 2 yuan, worm gear 1 yuan, chain 1 yuan per section. The 168-tooth gear and the final 9-tooth and 15-tooth gears are unavailable, including toothed bushings. Technic beam with holes 10 yuan, Technic beam 2.5 yuan, motor + battery box 130 yuan. Other special parts not included in the calculation vary in price. The total cost is roughly equivalent to a Lego 45544 set.
