What’s the most functional/useful item u have printed
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The most functional print I have made gets used everyday, my razor stands. Nothing super fancy but practical.
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Vacuum hose adapters!
I can’t overstate how cool it is to connect your very expensive tools to your very expensive hepa filter job-site vacuum without the use of skeezy duct tape.
Sainsmart TPU is superb for this application and my Biqu B1 cranks them out at 45mm/sec.
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Most useful so far, a mini honeycomb tool organizer. PrusaPrinters
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Not sure if it fits, but it’s pretty functional. I 3d-printed plates / mounts / shelves for my home mini server. I built the case itself out of wood (quickly and poorly, heh), and used a pair of 12U rails - and then used shelves from a 10" Server Project. It results in a reasonably tidy setup.
I’ll need to conquer my fear of PETG and print them with a more resilient material; I actually lost my nvidia shield shelf today because it warped so much from the heat. I could also design a proper shelf for it that is more a combination of side brackets for it, leaving the bottom exposed…
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There’s a lot. But probably the most practical was the drain fitting for the humidifier on our furnace. The original had crumbled. The one I modelled and printed has worked flawlessly for three years now. And, of course, if it fails, I still have the model. 
First print I ever did that was designed on my own was this print to replace the missing end on my chair. At the time I was so proud to get it to fit haha.
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