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Christmas Tree Ornament

by plainolddave, published

Christmas Tree Ornament by plainolddave Jul 14, 2013
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Summary

Hi everyone - after a suggestion from one of the folks here (http://www.thingiverse.com/thing:106329) this model has been remixed as a christmas tree ornament!
The STL files print a sphere 100mm in diameter. The top hemisphere comes in two versions - one is just a plain solid hemisphere, and the other has space in the middle to put in an LED - your choice of which one to make.

[EDIT 17 Jun 14] just posted some photos where I finally got around to adding LEDs - the "trench" piece in the middle looks cool laser cut from 3mm clear or opal acrylic with four LED's around the equator, plus a fifth LED in the laser dish. As an alternative to laser cutting, try 3D printing the middle from semi-translucent flouro filament

Also posted solidworks zip files - enjoy!

Instructions

Print out the hemispheres, the middle spacer and the two locating pins, then glue them together. Some of the trenches overhang a little but it prints fine without support - 10% infill is fine.

The LED version takes a standard 3mm LED - push fit into the middle the laser dish and solder a resistor in series

Use hot-melt glue to hold 4 x 3mm LED's and resistors in place in the middle (use the trench/equator piece with a cross shape to position LEDs in a star shining outwards) and run clear twin core wire up through the hole underneath the hanger loop, to both hang the ornament and power the LED's

The 'laser' is a work in progress and will probably need to make changes - at the moment assembly is quite fiddly/fragile while supergluing the parts together - print some spares just in case.

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I'm trying to put the LEDs together, but I'm having a hard time figuring out how to connect everything. What kind of battery is needed for this? How strong should the resistor be?

Any chance someone has a picture detailing the innards of this thing with the lights set up?

Could I bribe you into posting STP (not STL) files of the top, bottom, and trench pieces?

Hi there - sure thing...

I've uploaded an assembly file saved from Solidworks in STP format (STEP AP214). I'm not familiar with STP but it seems to have all parts in one file - if that doesn't work let me know and we can retry...

Cheers

Hey I really appreciate that! Turns out my CAD program can open SLDPRT files after all, so I used that instead. I have one of those magnetic floating globes at work, I'm gonna make a death star version :)

I printed this out with 2 shells and 0% infill and it turned out quite well! There are some gaps in the top trenches and the top and bottom are a little messy but still works quite well. Thanks for the thing :)

"Some of the trenches overhang a little so it'll need support to print" - how do you remove this support? For my experience this would come out ugly to remove - you will see any scratches...?!

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