Marble Machine with Hand Crank and Three Return Ramps

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Bounding box: 180.0 × 98.0 × 228.0 mm
Engine: Precision B-rep
Parameters: 23
Published: November 12, 2026

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The prompt

Make me a marble machine that has a hand driven wheel that lifts marbles to run through to the back side. On the back I want three ramps bringing the marble back to the bottom and back out to the front so they can be ready to be lifted by the wheel again. Design for 16 mm marbles.

Parameters

Name	Value	Range
Marble Diameter	16 mm	10 – 25
Backboard Width	140 mm	100 – 220
Backboard Height	220 mm	160 – 320
Backboard Thickness	6 mm	3 – 12
Lift Wheel Diameter	110 mm	70 – 180
Lift Wheel Width	14 mm	8 – 30
Marble Pocket Count	8 count	4 – 12
Marble Pocket Diameter	20 mm	16 – 30
Axle Diameter	8 mm	4 – 16
Ramp Width	26 mm	18 – 45
Ramp Thickness	3 mm	2 – 8
Ramp Rail Height	7 mm	3 – 15
Ramp Rail Width	3 mm	1 – 6
Crank Arm Length	55 mm	30 – 90
Crank Grip Diameter	10 mm	6 – 18
Crank Grip Length	20 mm	10 – 40
Base Width	180 mm	120 – 260
Base Depth	90 mm	50 – 160
Base Thickness	8 mm	4 – 15
Return Tray Width	100 mm	60 – 160
Return Tray Depth	50 mm	30 – 100
Return Tray Wall Height	7 mm	3 – 15
Return Tray Wall Thickness	3 mm	1 – 6

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

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