My 3d-printed bobbin has arrived!  It’s very pretty, and the raindrop-patterned endpieces are perfectly sturdy, but I made the columns of the shaft much too thin (2 mm diameter).  They bend under even slight pressure from a finger, and spinning is possible only near the ends of the bobbin.  Nearer to the middle, the columns bend inward from the pressure of the yarn being spun, to the point that they will touch and rub against the supporting metal shaft.  Changing the columns into one continous cylinder of plastic would of course make the whole thing much stronger, but also prohibitively expensive.
Nonetheless, it was a good experiment.  I’ll try to make this one useable, and I’ll probably try to rework the shaft so that it will be stronger and hold its shape better without adding too much volume to the design.  What I’d really like to find is a physics simulator where I could input my design and then, say, twist it or drop weights onto it from different angles…
Zoom Info
Camera
google Nexus S
ISO
100
Aperture
f/2.6
Exposure
1/40th
Focal Length
3mm
My 3d-printed bobbin has arrived!  It’s very pretty, and the raindrop-patterned endpieces are perfectly sturdy, but I made the columns of the shaft much too thin (2 mm diameter).  They bend under even slight pressure from a finger, and spinning is possible only near the ends of the bobbin.  Nearer to the middle, the columns bend inward from the pressure of the yarn being spun, to the point that they will touch and rub against the supporting metal shaft.  Changing the columns into one continous cylinder of plastic would of course make the whole thing much stronger, but also prohibitively expensive.
Nonetheless, it was a good experiment.  I’ll try to make this one useable, and I’ll probably try to rework the shaft so that it will be stronger and hold its shape better without adding too much volume to the design.  What I’d really like to find is a physics simulator where I could input my design and then, say, twist it or drop weights onto it from different angles…
Zoom Info
Camera
google Nexus S
ISO
100
Aperture
f/2.6
Exposure
1/16th
Focal Length
3mm
My 3d-printed bobbin has arrived!  It’s very pretty, and the raindrop-patterned endpieces are perfectly sturdy, but I made the columns of the shaft much too thin (2 mm diameter).  They bend under even slight pressure from a finger, and spinning is possible only near the ends of the bobbin.  Nearer to the middle, the columns bend inward from the pressure of the yarn being spun, to the point that they will touch and rub against the supporting metal shaft.  Changing the columns into one continous cylinder of plastic would of course make the whole thing much stronger, but also prohibitively expensive.
Nonetheless, it was a good experiment.  I’ll try to make this one useable, and I’ll probably try to rework the shaft so that it will be stronger and hold its shape better without adding too much volume to the design.  What I’d really like to find is a physics simulator where I could input my design and then, say, twist it or drop weights onto it from different angles…
Zoom Info
Camera
google Nexus S
ISO
100
Aperture
f/2.6
Exposure
1/15th
Focal Length
3mm

My 3d-printed bobbin has arrived!  It’s very pretty, and the raindrop-patterned endpieces are perfectly sturdy, but I made the columns of the shaft much too thin (2 mm diameter).  They bend under even slight pressure from a finger, and spinning is possible only near the ends of the bobbin.  Nearer to the middle, the columns bend inward from the pressure of the yarn being spun, to the point that they will touch and rub against the supporting metal shaft.  Changing the columns into one continous cylinder of plastic would of course make the whole thing much stronger, but also prohibitively expensive.

Nonetheless, it was a good experiment.  I’ll try to make this one useable, and I’ll probably try to rework the shaft so that it will be stronger and hold its shape better without adding too much volume to the design.  What I’d really like to find is a physics simulator where I could input my design and then, say, twist it or drop weights onto it from different angles…

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