Direct Sleeve on top of a Plane

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[>>>] Generating Attributions log:

[0] Thing Title : Bird feeder cup
[0] Thing URL : http://www.thingiverse.com/thing:31466
[0] Thing Author : TheGrum
[0] Thing Licence : Creative Commons - Attribution - Share Alike

[1] Thing Title : Sleeve Valve Engine Model
[1] Thing URL : http://www.thingiverse.com/thing:33883
[1] Thing Author : emmett
[1] Thing Licence : Creative Commons - Attribution - Share Alike

[2] Thing Title : C