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I just modelled a 3d-printable version of the "tube hidden inside handle" design: http://incoherency.co.uk/interest/pythagoreancup.stl http://incoherency.co.uk/

I just modelled a 3d-printable version of the "tube hidden inside handle" design: http://incoherency.co.uk/interest/pythagoreancup.stl http://incoherency.co.uk/interest/pythagoreancup.stl It's not printed yet, but apart from the excessive overhang at the top of the handle I think it will work. Side view at 50% opacity: https://img.jes.xxx/2003 https://img.jes.xxx/2003

abcd_f 8y ago
The problem with this design is that you can only drink from the cup with the handle facing away from you.
- jonsen 8y ago
  The handle at a right angle but no closer is okay.
  - jstanley 8y ago
    I think it can be slightly closer to you than that. The cup is wider at the top than the bottom, which means when you tilt it over you are removing some liquid from a narrow part of the cup and adding an equal volume of liquid to a wide part of the cup. That means the level drops slightly.
mrfusion 8y ago
I’d make sure the tube is pretty wide. I made one and it wasn’t very impressive to wait 30 seconds while the water trickled out. Just seems like a leaky cup. I’d go more for a toilet flush type of thing if I redid it.
- jstanley 8y ago
  You're right :) It finished printing and works as it should, but it takes an extremely long time to drain. tobr suggested an alternative design elsewhere in this thread: https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9... - I think it would be easier to conceal a larger tube within that, so I might have to try that too.
  - mrfusion 8y ago
    Could you share the file with me if you end up doing that other design? I’d love to try it out too.
    - jstanley 8y ago
      Here you go: https://incoherency.co.uk/interest/pythagoreancup2.stl https://incoherency.co.uk/interest/pythagoreancup2.stl And a 50% opacity view: https://img.jes.xxx/2005 https://img.jes.xxx/2005 The first cup took 90 seconds to drain about 200ml. The cross-sectional area of the tube in the second version is about 4.7x larger, so if my beginner-level understanding of Bernoulli's principle is accurate, I expect it to drain about 4.7x faster, so maybe it'll empty itself in 20 seconds instead of 90.
      - jstanley 8y ago
        This one drains in 12 seconds, but only contains 150ml due to the reduction of the inner diameter at the bottom. The average flow rate is 12.5 ml/sec vs 2.2 ml/sec before, so it's 5.6x better!

abcd_f 8y ago

The problem with this design is that you can only drink from the cup with the handle facing away from you.

jonsen 8y ago
The handle at a right angle but no closer is okay.
- jstanley 8y ago
  I think it can be slightly closer to you than that. The cup is wider at the top than the bottom, which means when you tilt it over you are removing some liquid from a narrow part of the cup and adding an equal volume of liquid to a wide part of the cup. That means the level drops slightly.

mrfusion 8y ago

I’d make sure the tube is pretty wide. I made one and it wasn’t very impressive to wait 30 seconds while the water trickled out. Just seems like a leaky cup. I’d go more for a toilet flush type of thing if I redid it.

jstanley 8y ago
You're right :) It finished printing and works as it should, but it takes an extremely long time to drain. tobr suggested an alternative design elsewhere in this thread: https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9... - I think it would be easier to conceal a larger tube within that, so I might have to try that too.
- mrfusion 8y ago
  Could you share the file with me if you end up doing that other design? I’d love to try it out too.
  - jstanley 8y ago
    Here you go: https://incoherency.co.uk/interest/pythagoreancup2.stl https://incoherency.co.uk/interest/pythagoreancup2.stl And a 50% opacity view: https://img.jes.xxx/2005 https://img.jes.xxx/2005 The first cup took 90 seconds to drain about 200ml. The cross-sectional area of the tube in the second version is about 4.7x larger, so if my beginner-level understanding of Bernoulli's principle is accurate, I expect it to drain about 4.7x faster, so maybe it'll empty itself in 20 seconds instead of 90.
    - jstanley 8y ago
      This one drains in 12 seconds, but only contains 150ml due to the reduction of the inner diameter at the bottom. The average flow rate is 12.5 ml/sec vs 2.2 ml/sec before, so it's 5.6x better!