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What is webbing? See the following image. Webbing refers to the creases that form in the heated plastic as a result of internal stresses as the plastic is stretched over a mold. Webbing is more likely to occur if the plastic is overheated.
What is webbing? See the following image. Webbing refers to the creases that form in the heated plastic as a result of internal stresses as the plastic is stretched over a mold. Webbing is more likely to occur if the plastic is overheated.
[[File:Webbing Example.jpg|1000px|none]]
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By contrast, the following image shows what happens if the plastic is underheated. Underheated plastic will not draw down enough to form the shape you are intending. Turns out that this particular shape was more difficult than expected.
[[File:Underheating Example.jpg|1000px|none]]
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The following image shows the mold I used to attempt the shape of Darth Vader's tie fighter. I used the dome-shaped 3D print mold in conjunction with a scrap piece of wood that I cut in half and modified in the wood shop. Notice that after vacuum forming, the plastic did not draw down all the way between the dome and the two wood pieces.
The following image shows the mold I used to attempt the shape of Darth Vader's tie fighter. I used the dome-shaped 3D print mold in conjunction with a scrap piece of wood that I cut in half and modified in the wood shop. Notice that after vacuum forming, the plastic did not draw down all the way between the dome and the two wood pieces.
[[File:Robot Mold Example.jpg|500px|none]]
[[File:Robot Mold Example.jpg|500px|none]]