So the plastic of all 3 keys of my family's Mitsubishi Space Star has deteriorated due to old age. I can't really fault it after 20 years though. :)
I tried to shop around for a new shell or a sleeve but couldn't find any for the “stupid” key. There are some for the version with "remote open" functionality, but those didn't help me.
That's the reason I whipped this version up.

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If you want to help me out a bit and see some stuff I made, work in progress, or models before they will be here consider liking and following my Facebook page, thank you very much - it means a lot to me! :)

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The original key is composed of a metal blade which is coated in hard plastic, which in turn is coated in smoother plastic. The UPPER version is always needed.
Which lower version you need depends on how far broken down your key is. I would recommend not to remove the hard plastic.

• Print with:
  • PLA
  • 6 wall loops
  • 100% infill
  • no supports are needed
  • outer brim
  • 0.15 Brim-object gap
  • X-Y hole compensation 0.2 (Your printer might need another value here)
  • Textured PEI plate

• Additional stuff:
  • Try to put the two parts together first. (See if pins fit in holes)
  • Try placing the key in the lower part only if both fit together.
  • Glue both parts together. No need for glue on pins.

• Parts:
  • Mitsubishi_SpaceStar_2003_BOTH_Key_Housing_Upper
    • Always print this.
    • The Mitsubishi Logo is paintable with the bucket tool in your slicer.
  • Mitsubishi_SpaceStar_2003_BIG_Key_Housing_Lower
    • If you still have the hard plastics part around your key use this.
    • Recommended.
  • Mitsubishi_SpaceStar_2003_SMALL_Key_Housing_Lower
    • If you only have the metal part left, use this.

• Updates:
  • none

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I'm looking forward to your comments and makes. :)