Oh this is gonna be good. You owe me an apology.

v -0.0581395320669 0 0
v -0.0436046490502 0 0
v -0.0436046490502 0.116279064134 0
v -0.0581395320669 0.116279064134 0
v 0.0436046490502 0 0
v 0.0581395320669 0 0
v 0.0581395320669 0.116279064134 0
v 0.0436046490502 0.116279064134 0
v -0.0436046490502 0.101744181117 0
v 0.0436046490502 0.101744181117 0
v 0.0436046490502 0.0145348830167 0
v -0.0436046490502 0.0145348830167 0
v 0.0436046490502 0.0145348830167 0.0
v 0.0333269347053 0.0914664667722 -0.0102777143449
v 0.0333269347053 0.0248125973616 -0.0102777143449
v -0.0436046490502 0.0145348830167 0.0
v -0.0333269347053 0.0248125973616 -0.0102777143449
v -0.0333269347053 0.0914664667722 -0.0102777143449
v 0.0581395320669 0 -0.116279064134
v -0.0581395320669 0 -0.116279064134
v 0.0581395320669 0.116279064134 -0.116279064134
v -0.0581395320669 0.116279064134 -0.116279064134
vt 0 0
usemtl Box
f 1/1 2/1 3/1 4/1
f 5/1 6/1 7/1 8/1
f 9/1 10/1 8/1 3/1
f 2/1 5/1 11/1 12/1
f 13/1 10/1 14/1 15/1
f 9/1 16/1 17/1 18/1
f 10/1 9/1 18/1 14/1
f 16/1 13/1 15/1 17/1
f 17/1 15/1 14/1 18/1
f 19/1 6/1 1/1 20/1
f 21/1 7/1 6/1 19/1
f 22/1 4/1 7/1 21/1
f 20/1 1/1 4/1 22/1
f 22/1 21/1 19/1 20/1

Which of those faces is not a quad? 

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)