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PETG suitable?  

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Durahl
(@durahl)
Trusted Member
PETG suitable?

So I'm currently working on a Dining Table Lamp and the initial Idea was to CNC it myself out of wood prepared by a carpenter, but I guess checking if I like the "design" to begin with wouldn't be the worst idea so I came to the conclusion to 3D Print a Stand-in first which brings me to the material choice ( at hand ) being Prusament PETG.

 

The wooden model looks like this:

The Log itself is 120cm long and would hang down from the ceiling on 4 wires,
two carrying current and a third for ground connecting to a Smart Switch in the lamp.

 

The idea for the 3D Printed model would be to make it look like a Crane Boom Arm with the typical skeletonized look of one.
Two M3/M4 threaded rods would them form the spine for the 3D Printed Pieces not to fall apart and the Ceramic Lamp Bases would then somehow be attached to the whole construction.

 

As can be seen in the 3D Model above, the Bulbs ( 4x Osram Vintage 1906 24W )  would end up REALLY close to the 3D Print and while it doesn't worry me for structural integrity with the threaded rods holding everything in place I'd still prefer for them the areas near the bulbs to warp so yea...

 

Can Prusament PETG with its reported 68°C Heat Resistance still be used for that task?

Posted : 04/11/2020 1:52 am
jsw
 jsw
(@jsw)
Noble Member
RE: PETG suitable?

IIRC a 25 watt frosted incandescent light bulb, like the ones you (used to) get in the States would heat to about 90F on the surface, which would be about 32C, so you probably have some margin in there.  This is only an educated guess.  With a 200mm globe, there would be more distance between the filament and the glass surface than with the standard domestic bulb, so that would add a safety factor.

Posted : 04/11/2020 8:50 am
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