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GE ConstantOn 5mm Bulb Adapter — image 1
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GE ConstantOn 5mm Bulb Adapter

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You can't buy bulbs for these light strings anymore, but don't throw away your pre-lit tree just yet!

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I have an older pre-lit artificial Christmas tree, made by Santa's Best Craft.  The lights are a GE ConstantOn string.  

The light string uses a weird bulb - it's a 6mm bulb with a weird pinched base.  I can't find the proper bulbs anywhere, but I have a 3d printer, and I can find 5mm round base bulbs easily.

You'll need to get a pack of 2.5v round-base incandescent bulbs. (I used these bulbs)
 

  • Printed in Filaments.ca Econofil Dark Green but I bet that just about any filament will work
  • .08 layer height (or smaller).  They don't take long to print at finer resolutions
  • No supports
  • You'll probably want an outer brim for better bed adhesion

     

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