Stretchy Bracelet
Description
UPDATE: At the request of nycdesigner, a couple of alternate designs are now also available.
Instructions
These STLs have an inside diameter of 55mm, so scale as necessary. You can also adjust the parameters in the OpenSCAD file, and it will print out the resulting diameter. The springiness works great with ABS, and apparently PLA works as well.
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Check out this month's edition of RepRap Magazine (free online). This is one of the objects they used in their slicer shootout, and most of the programs had trouble. Try slicing this with Cura. After a month of fighting with the object, I got it to print this evening!
I made one with "normal" PLA and it was too brittle. I had to scale it up 120% to fit (which improved the print quality), but several of the inner triangles were stuck together, and while I was trying to snap them apart I snapped the whole thing. Now it's just a spring thing ;< Going to try with ABS next. Any suggestions as to how to get the "inner points" of the triangles to not touch? I believe I have the slic3r config working (it just prints the bracelet with a single filament going all the way around) but the inner points sometimes "touch".
Brilliant! Sliced with no problem using Slic3r and a 0.3mm nozzle but I had to follow the advice from FalcolnFour below when I tried to create GCode using Slic3r for my 0.5mm nozzle. Printed several of these in PLA and ABS - all good. Tried the options in OpenSCAD but like the original design in clear PLA the best. Christmas is coming .......!
Stretchlet is a preloaded model on the spanking new MB Replicator 2 which is a sensational machine. Went from unpack to set up to Stretchlet in 15 minutes flat. Looks great in transparent PLA.
Thanks a lot for sharing your design! We have printed it hundreds of times during the Maker Faire in NY. We added some gcodes to launch it with the printhead from our Ultimakers to shoot it into the public! The audience loved it!!!!
Thanks again!
Siert Wijnia
Co-founder Ultimaker
Ps. Best regards from Erik, he met you last year at the Maker Faire
Has anyone gotten this to work with Slic3r? My daughter got one from the Makerbot Booth at Maker Faire yesterday and was very excited. I tried to print another one with my printrbot for her but no matter how big I scale it, the machine wants to draw an inner circle, then a series of attached triangles, rather than one continuous line.
Any tips? I've tried a number of variant slicing settings- slicer totally hangs on Stretchlet.stl, so all my attempts have been based off Stretchlet1.stl.
This ones printed with Diamond Age PLA, havent seen an ABS version, but i'd love to know how it compares in ABS.
Fun, fast print. It printed perfectly on a Replicator, 0 infill, 0 extra shells, fill disabled in profile. I am surprised how flexible and durable it is. Good stuff! 8-)
Slic3r wont slice the stretchlet.stl
and the stretchlet1.stl is seen as a circle with triangles attacked to it instead of actually being a line :(
I got it to slice Stretchlet1 properly and print in a continuous line as designed... but my extruder calibration is driving me nuts. It printed OK (protip: don't add a brim like with pretty much every other print... it's a pain to remove), but the extrusion width was too narrow to make it very strong. Here's what I used:
Height: 0.3mm
Perimeters: 1
Generate extra perimeters when needed: DISABLED
Solid layers: 0
Fill density: 0
Advanced -
&
gt; Extrusion width -
&
gt; Default: 0.4mm (I think this is the key)
I'm not surprised it had trouble with stretchlet.stl; stretchlet1.stl is a much better bet. And each cross-section does indeed look like a circle with triangles attached; if you print only the perimeter (as per the instructions), that forms a crooked line. So it sounds like it's working; post a pic if I'm wrong.
Just printed a bunch of these - I'll upload pics shortly. They're great - they print fast, don't use much plastic, and are the first thing my daughters have been interested in from the Replicator. Thanks.
Since others are talking about how to print it, I'll say that for me printing was easy - I just made 'perimeter' profile, with the 'fill' module turned off, printed with 0% infill, and it came out fine. I've printed in "gold" and "silver" so far, and trying PLA next.
Dale Dougherty (founder of Make) brought one of thse to the panel that he and I spoke at this past week in Washington DC, and now I want to print one but I'm having problems.
Are you guys using ReplicatorG to print these?
I'm using ReplicatorG on a Mac under Lion to print to a TOM.
I have tried the settings you recommend:
Object Infill (%) = 0%
Layer Height (mm) = 0.3
Number of Shells = 0
Feedrate (mm/s) = Anything
It tris to build the model as a big solid.
What am I doing wrong?
Thanks!
Awesome. You'll have to dig a little deeper than Print-O-Matic settings. It's not enough to put infill at zero %; you have to turn off the fill plugin entirely (so it doesn't make the top and bottom surfaces). In ReplicatorG, go to the Gcode menu -
&
gt; Edit base profiles. I make a new profile called Perimeter for these kinds of prints. In that profile, go to Fill and uncheck the "use infill" box at the top. When you create your Gcode, just select your Perimeter profile.
Thanks, this is great - as others have been mentioning it really opens up the door to other unique functional applications.
These might make nice tank tracks!
Very cool as intended bracelet too, of course. Excellent work.
I believe there is a thing out there for each person, which when seen will make that person under stand the power of the MakerBot. This is one of those things for many people.
Made one as a first object with a new hot-end i designed: http://www.thingiverse.com/thi...
Great design! Thanks a lot!
Red is ABS; yellow is PLA. Both work well.
Thx for the great design. Can you please make one without the cabled ribbing? And maybe another with ribbing that's horizontal rather than angled?
Thanks for the pix; that's great that it works with PLA too. The OpenSCAD script is pretty simple; there's a module called base that defines the outside shape. It should be pretty simple to replace that with any other cylindrical-ish shape you desire. I'd love to see customized versions.
You don't set the infill to zero and extra shells to zero. You actually just turn off infill. Just uncheck it and it will only make the perimeter.
License
Made 2 using Taulman 618 nylon. Dyed using Jetty's process of 50/50 vinegar/water and some food colouring (4 drops to 1/2 cup liquid). Bring to a boil and leave it until you get the colour your after, the longer it's left the darker the colour! Oh first time I boiled it with the object in.. by the time I took it off the heat (the small one) it was that dark! So I think a better method is to bring it to a boil and dip the object afterwards until you get the colour your after.
DO NOT heat the mixture in the microwave without the object in the liquid! It "blew up", food dye all over the microwave, I figured it's just liquid why would that happen :)
The triple colour one is 30cm high.. So I put 10cm in 2 different bowls... and just flip it over... (I rinsed it in water after each so it wouldn't run)
http://www.thingiverse.com/mak...
Great design! I couldn't figure out the Customizer.. So I just edited the Scad file :)
Ben
Very nice, I like the watermelon one. I see you discovered the superheated water phenomenon. Thanks for the info.