Pinball-Style Marblerun Plunger for Duplo Hubelino

Bring a whole new level of fun to your marble runs! 

This plunger module lets you launch marbles just like in a classic pinball machine – perfect for Duplo and Hubelino systems.

---

Features

Pinball-style marble launcher for dynamic starts

Fully compatible with Duplo/Hubelino-sized building systems

Strong spring force for powerful and consistent launches

Modular design – easy to print and assemble - no support

Adds interactivity and skill-based play to your marble track

---

Parts Overview (8 Components)

1. Base

Mounts onto the studded plate, holds all components, and guides the marble

2. Plunger Rod

Main moving element that launches the marble

3. Handle

Comfortable grip for pulling back the plunger

4. Main axle

Structural core of the mechanism

5. 2x Axles

Used to hold and guide the springs

6. 2x Springs

Available from the Bambu Shop (link below)

---

Assembly Instructions

1. Insert all rods from below into the plunger rod (as shown in the images, use an allenkey to apply some preasure)

2. Slide the springs onto the rods.

3. Push the rods through the base.

4. Attach the handle from above, applying slight pressure to fix it in place. (as shown in the images, use an allenkey to apply some preasure)

Tip:

Flip the entire assembly upside down during installation – this makes it much easier to guide the rods into their grooves.

---

Safety Note

The spring preload is quite strong. Please use the plunger carefully and responsibly.

---

Support

If you like this design, I’d really appreciate a boost