50 kinds of gear package schemes:

2mm motor and 2mm axle as the starting point, all series gears and plastic parts are 2mm holes, with spindle gear and single-layer gear as part, belt pulley and belt as part, 130 motor and related parts as part, chassis related parts as part.

Train of thought starting point: the first is to be able to make a car chassis (main figure reference), other accessories can develop their own use, deceleration group, belt drive group and so on can.

14 kinds of single layer gears: 82A 92A 102A (three kinds of white, yellow and blue) 112A 122A 132A 142A 152A 162A 182A 202A 102A long orange red5 kinds of single layer gears:562A blue 502A soft orange red 542A 482A 442A

Crown gear 4 kinds:C322A C20082A C36082B before C24102B6 double-layer gears:22082B 24122B 24102B20102B 30162A 50102A7

kinds of pulley: 62A orange red 102B 9.32a 132A 182A red 242AB blue 302A4

kinds of worm and tee: W6*62A W6*102A tee green, tee blue

There are 9 kinds of motors and chassis: 130 motors, motor bracket,2mm axle 2kinds (2 pcs), yellow window panel, Angle iron (4pcs), 2A axle sleeve (4pcs), 302A blue wheels (4pcs), M2.3 screws (12pcs)1 rubber band (3 models) :Small color (2pcs), green (2pcs), red (2pcs)