Drivetrain Builder

Build a train stage by stage. Mesh a gear, stack a pulley on the same shaft, belt it onward. Ratios and directions solve as you go.

Train

Add to the selected part

Stacking puts a second gear or pulley on the selected shaft. That is how you step down twice without a huge single gear.

Selected part

Overall

Stage by stage

Checks

Export

Identical parts are exported once. Millimetre-true, import at 1:1.