by schlem, published
This thing was made with Tinkercad, but you can design your own in the Customizer: http://www.thingiverse.com/thing:93859
We use wedges like these to block open doors like a doorstop or at the hinge. Two wedges can be pushed together inside the frame of a sprinkler head to shut off the (copious) flow of water. Not sure if ABS is up to the stresses of closing a sprinkler head - I guess I will have to test. Print it in a bright color so that you don't lose it on the fireground.
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The observant reader will notice that I didn't print this in a bright color...
Also, the narrow tip of this object curled upwards a bit, maybe from when I pried it off the Kapton, but it may have been curled before. I made another version with less of a point and it curled less. I have much to learn, but this came out well.
I find watching the lattice of interior fill get printed fascinating. Stay safe!