Big StrawGlass - Practical
by bLITzJoN, published
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I love the novelty of the original Big StrawGlass, but it takes some lungs to draw some liquid goodness through all that straw. So, I've remixed it to provide a more "practical" spiral straw that still looks like the original, but easier to clean, quenches the thirst and provides a better drain at the bottom of the glass. In the picture above with two glasses, can you tell which one is the original?? hint
Just so people don't complain, you should strongly consider using food-safe plastic. Since I can think of so many other things to worry about, I printed in ABS and even vapor-washed it cause I'm cRaZy like that.
NOTE: If you plan to print in ABS so it holds up better in the dishwasher then vapor wash it. If you're unfamiliar with the process, Google is your friend. I don't have an elaborate setup, I simply have a big glass cookie jar I sit upside down on a glass pie pan with a piece of cardboard lining the inside I saturate with Acetone and let the item sit in for several hours until I see a nice sheen. Take it out and let it air dry for a day (which it will continue to smooth as the acetone evaporates out of the plastic).
So I commented it's basically at your own risk like anything else you print. However, the question has come up if there are resources, processes, plastics, etc.. that could help deam this "food safe". Little bit of research lend me to a couple articles about the subject:
What started this was discussion about XTC-3D not really being food-safe.
The original calls for 100% infill. I'll leave that to your discretion. If you print in ABS, plan to vapor wash it; I can tell you that even at 100% infill you may experience leaking as ABS is notorious for layer de-lamination/cracking.
For the v5, I recommend 0% infill (yes, that's zero) with 50 solid bottom layers, 3 solid top layers and 3 shells. With the bottom being 100% infill with all the solid layers, you will definitely want to print with a raft for ABS to prevent warping.
2016-06-05 - I published straw-glass-practical-v5.stl. I'd like the file size to be lower but it is what it is. Unless I get a flood of complaints I'll make this the final update. Enjoy!
2016-05-19 - Finished print of straw-glass-practical-v5-beta.stl and it's not leaking!!!! I printed in ABS just in case so I could vapor wash to salvage the print; fortunately, so far so good!! (see green spiral glass). Before I make it the final stl, I need to trim off approx 1mm off the bottom. I don't feel it's necessary.
2016-05-17 - Welcome to a higher resolution and curved fills on the inside of the glass in an attempt to form thicker walls between the tube. straw-glass-practical-v5-beta.stl may become the final version unless the print comes out with deformities.
2016-05-04 - My test print of straw-glass-practical-v4-beta.stl in ABS at 20% infill and 3 top/bottom/outer layers still leaks unless I vapor wash it in order to chemically seal the imperfect layer adhesion of ABS. I have a new "high-res" version of v4 I'm printing in PLA to see if maybe ABS isn't the right stuff unless you intend to vapor wash it. I'm updating some of the details above with my findings.
2016-05-04 - straw-glass-practical-v4-beta.stl decreases the inner diameter of the straw in an attempt to further prevent leaking. I smoothed out the walls further and made some adjustments to some key points where I think layer holes may occur based on how the model slices. The last model I actually experienced some sweating which could pass as condensation, but given the color of the liquid it was leaking. Vapor washing did stop the leaking. Hopefully this model will net decent results.
2016-04-26 - straw-glass-practical-v3-beta.stl is the next iteration of improving the straw and fixing the weird mid-section. I married the new straw and glass in Meshmixer and imported into Tinkercad where it translated the stl by making the entire glass solid. While in Tinkercad, I hollowed the straw. Returning the final model into Meshmixer to correct any fragments and I smoothed the inside of the straw at the top. Sooo, I would definitely not print 100% infill. I'm about to kick off a print.
2016-04-25 - straw-glass-practical-v2-beta.stl is an updated version with a cleaner insides of the straw (most attention to the top) and a larger bowl at the bottom. I haven't printed it, yet, so I'm listing this as beta. Looking at the original, what I thought was filled by me is actually flawed to start with, the mid-section is actually solid. Once I get one printed and tested (I won't vapor wash it) to see if there's any leaking - I'm thinking of printing in 20-50% infill (haven't decided) and see what happens. If someone beats me to it, please share!
Ok, so I loaded the model in 123D Design and it's definitely a Tinkercad issue that fills in the mid-section. Since the add-on straw (my addition) is fine, I may not even bother since it's not used anyway, but at least the mystery is solved and the original is fine. I wondered cause I've actually used the original and it works, but not "practical".
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Big StrawGlass - Practical by bLITzJoN is licensed under the Creative Commons - Attribution license.
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