A marble funnel with an escape route
A modular marble-run idea where recovering a stalled ball is part of the design, not an operation involving shaking the whole table.
The interesting part of a marble run is often the handoff. A ball behaves nicely in one section, then meets the next section at exactly the wrong angle.
This little rig concentrates on one handoff: funnel, short chute, catch tray. A slotted support makes it possible to change the height without rebuilding everything.
Start at the exit
Secure the funnel and make sure its outlet clears the chosen marble. Remove sharp edges. Build a generous catch tray before doing any runs; retrieving balls from under furniture is not a useful measurement.
Keep the same marble and release position for the first series. Note where the ball enters the chute, whether it bounces, and where it stops. Change the height or the chute angle, not both at once.
A felt liner is worth trying after the bare tray has been observed. It may make the landing quieter, but it also changes how quickly the ball stops. That is another variable, not a free improvement.
The unglamorous test
Can the rig repeat an ordinary run several times? A spectacular one-off path is entertaining. A repeatable path gives you something to adjust.
Keep small balls away from young children and pets, wear eye protection when cutting components, and avoid launches or powered acceleration. Gravity gives this experiment enough to do.
Materials
- Removable funnel
- Short open track sections
- One consistent ball size
- Catch tray and stable supports
Build Steps
- 1
Start with one transition
Test only the funnel outlet and first track section.
- 2
Keep recovery access
Make the funnel removable without shifting the supports.
- 3
Test stalls deliberately
Check slow entries and closely spaced balls over a catch tray.