Toilet seat mounting pin
thingiverse
I've designed this plug/pin since chinese ones cost about 10 euros and you have to wait a month for shipping. All you need for assembly - hex nuts and 6mm bolt. Print only with TPU or other flexible stuff. The way it works is by expanding itself when being tightened (because of flex filament). 2 years of usage and I haven't noticed any wear or damage.
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