This is a cipher lock for keeping the helmet safe on a bicycle.
See the story on the image for more details.
Assembly Manual-Helmet Lock file can be downloaded free at: https://www.behance.net/gallery/141227167/Helmet-Lock-Assembly-Manual?share=1 https://www.thingiverse.com/thing:5324277
Don't forget to change the suffix of Assembly Manual-Helmet Lock from .doc to .pdf to get more information.
Some parts need support, just let the slice generate support automatically.
80% infill is recommended for all parts. All parts can be printed in any print space bigger than 100mm x 100mm x100mm machine, like Voron V0.
Esun PLA+ or Polymaker Polyplus PLA has been proved to work well.
You need to prepare a bill of standard parts:
Springs:
Ø1*18*15 x1
Ø0.3*4*15 x1
Ø0.3*3*5 x4
Flathead screw:
M2*9 x4
Flange head bolt:
M6*30 x1
M6*35 x1
Flange head:
M6 x2