Hyperbolic Funnel

-German-

This hyperbolic funnel is an extension for a marble run.

The funnel is modeled after the "donation funnels" often seen in zoos or other public institutions.

The balls run slowly in the outer area; the further the balls get to the inside, the faster they become.

There is also an additional closing part for the funnel model.

Depending on the speed, the balls sometimes want to leave the funnel again through an opening on the other side.

Therefore, these openings can be closed with this plug (mirror the plug in the slicer if needed).

The funnel has its own "ring" with a cutout to prevent the ball from being obstructed at the outlet.

To be able to print the funnel, I have also designed a support structure.

The support structure is designed without air (gap) and must be moved in Z by -0.2 to -0.4 in the slicer program.

I let the support structure part be printed in my slicer (Cura) as a "support structure" (see picture).

The funnel is printed upright (with the support structure) (see picture).

The plugs and the ring are printed upside down.

To improve the quality of the funnel but also to save time, the "adaptive layers" option was activated in my slicer (Cura).

It starts with a layer thickness of 0.22 mm, and as the funnel becomes flatter, the layer thickness decreases to up to 0.1 mm.

(see picture)

To make the balls run longer and smoother, the funnel should be smoothed with sandpaper.

Here are two videos. Single ball Multiple balls

Update 29.12.19: Uploaded a second, stronger ring. Update 07.02.20: Uploaded the next size of the funnel upon request.

-English-

This is a hyperbolic funnel for a marble run.

This funnel is designed like a "donation funnel", which can be found in zoos or other public areas. The balls run slowly in the outer area; the further the balls come to the inside, the speed increases.

There is an additional closing plug.

Depending on the speed, the balls tend to roll off the funnel through an entrance on the other side. The unused entrances can be closed with these plugs.

(If necessary, you can mirror the plug in the slicer)

The funnel has an extra ring with a cutout so the ball doesn't stop when it goes through the runout.

The funnel needs support for printing. To optimize the printing time, I designed an extra part as support. It is designed without a gap, so it has to be moved in the Z direction by about -0.2 to -0.4 mm in the slicer.

For the support part, I chose the option "Print as Support" (see picture).

The funnel (with the support part) is printed upright.

The closing plug and the ring are printed upside down.

To increase the quality of the funnel and to save printing time, the option "variable layer height" is activated. It starts with a layer height of 0.22 mm; in the flat areas, the height changes to 0.1 mm (see picture).

Do some sanding on the funnel, so the marbles run longer and smoother.

Here are some videos. One marble Several marbles

Update 29.12.19: Upload of a second, stronger ring. Update 07.02.20: Someone wished for the funnel in the next size.

Print Settings

Printer Brand:

Creality

Printer:

CR-10S

Rafts:

No

Supports:

Yes

Resolution:

0.1 - 0.22 mm

Infill:

20

Filament: Basicfil + Enotpad PLA

orange + black

Category: Hobby