Strap Buckle 24mm

A small fix from https://www.thingiverse.com/thing:1001848, can be printed in the orientation shown in the picture (No support!)

* remove built in support from Female_Buckle
* fix polygon problem

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Hungarian blog post:
[zen3d.hu/5-hasznos-3d-nyomtathato-cucc](https://zen3d.hu/5-hasznos-3d-nyomtathato-cucc/ "5 hasznos 3D nyomtatható cucc")

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