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Marble Roller Coaster

by q2slinger Mar 11, 2019
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Thanks for your design! what's the best orientation for printing the archimedes screw? do you use regular supports or tree support? I use Cura slicer

Print it horizontally. I just used regular supports. I used a high support overhang angle (70 - 80 degrees). Only the center of the shaft needs a support. You might want to use a support brim if you have problems with build plate adhesion.

Thank you for great fun playing with it.
I like the light weight construction.
The lift of only 5 printed parts works very robust.

I have finished printing and assembling the thing. It is really great. I have only one problem and i was wondering if you can help me out.

The screw center rod is too weak and it keeps breaking off after a couple of rounds . Is it possible to change the design a bit to make that rod stronger?

Thanks a lot

Sorry to here that. I'll let you know when it's updated.

I've doubled the diameter of the archimedes screw shaft. Should be a lot stronger now. You'll need to print these files:


Thanks a lot :)
will try it and keep you updated

In the short track version could you clarify where the 90-banked,180-banked and short straight parts should be placed

Here are the pieces for the short layout starting from the lift going down hill:

  1. marble-coaster-straight (8 blocks supporting)
  2. marble-coaster-straight
  3. marble-coaster-ramp (7 blocks at low end)
  4. marble-coaster-180 (left)
  5. marble-coaster-ramp (6 blocks at low end)
  6. marble-coaster-straight
  7. marble-coaster-90 (left)
  8. marble-coaster-ramp (5 blocks at low end)
  9. marble-coaster-180-banked (left)
  10. marble-coaster-ramp (4 blocks at low end)
  11. marble-coaster-straight
  12. marble-coaster-90 (left)
  13. marble-coaster-straight
  14. marble-coaster-90 (right)
  15. marble-coaster-ramp (3 blocks at low end)
  16. marble-coaster-180 (right)
  17. marble-coaster-ramp (2 blocks at low end)
  18. marble-coaster-straight
  19. marble-coaster-90-banked (right)
  20. marble-coaster-straight
  21. marble-coaster-short-straight
  22. marble-coaster-180 (left)
  23. marble-coaster-lift-ramp

Only thing I can think of, as can't tell by the images, is if you can make the lift taller for longer runs. then this would be pretty much perfect.
I guess could also add funnels, or loops.. but they are not as needed.

Now you just have to add multiple routes with a selector. Love it!
Like the power supply old school. That first bit before the elevator needs some smoothing so the marbles don't need to get knocked in and it will be perfect.

Check out the latest version :) Thanks for the feedback.

Wow yea that is good stuff now you have this constant flow and more to keep you eyes busy with. Great job.
Now if you get enough height on there you should be able to get enough speed to get the marbles to loop...
Its such a scalable system, this can only get bigger.
A redesign on your elevator can make them stackable like 4 on top of each other.