3D Model: Design A Functional 3D-printable Elevator For Hot Wheels (1:64 Scale) With A Reinforced Base (150x100x5 Mm), Guide Rails, And A Non-slip Platform (140x80 Mm). Include A Rack-and-pinion Mechanism (8-tooth Gears, 2 Mm Pitch) For Smooth Manual Lifting, With Adjustable Height Stops (50 Mm And 100 Mm). Use Modular Snap-fit Assembly (0.2 Mm Tolerance) For Glue-free Construction. Optimized For PLA/PETG (30% Infill, 0.15 Mm Layer Height) With STL/STEP Files + PDF Instructions. Optional: DC Motor Mount And Measurement Markings. Error-free Design!