Magnetic Bed for 3D printer

Update 9/14/14
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Added a new version that does away with the tape and instead uses M3 screws of at least 8mm in length. SKP file also provided for customization.
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Installs the same way as the previous version as seen in photos of the previous version.
Although mainly created for use with http://www.thingiverse.com/thing:448686 here is hoping it may be useful for other applications to justify a separate Thing page.

Features
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Removable top portion secured by four