This is a replacement shade for my multi-head torchiere floor lamp. The original shades were made of ABS or some other translucent white plastic that had gotten brittle and yellowed over the years. 1 had completely disintegrated, and the other 4 would crumble with the slightest pressure.
So, I decided to put my new 3D printer to good use an make new ones! I modeled a form that I find more pleasing than the original boring "cup" shape, and printed 5 of them in white PLA. I'm using BAMTack! PLA, but of course you can use any filament you like.
One important note: If you print these shades, you MUST use either low wattage CFL bulbs or, better yet, LEDs. Otherwise, the head generated by standard incandescent bulbs will likely soften the PLA and cause the shades to sag at best, and melt at worst. If you burn down your house, it's your fault. You have been warned.
The base diameter of the shade is 2.5" OD, and the inner cutout circle is 1.5" diameter. If that's different that what your particular lamp needs, then of course this shade will not work for you without modification.
My original shades had ventilation holes in the base. I eliminated these for 2 reasons:
1) Since I'm using LEDs, heat isn't an issue and it prints faster without them.
2) The ring that locks the shade in place was completely blocking the holes anyway. Great design. :)
In the photo of the shades installed, the color difference is because 3 of the bulbs are CFL and 2 are LED. I'm replacing the rest with LED tomorrow.
The 3 shades on the right are the new ones. The 2 on the left are the original shades, for size and shape comparison.
Should be no post-processing required, unless you elect to use a skirt or brim, in which case of course you'll have to clean those up.
The main shell prints in 2 passes, so you likely will have a seam running down one side. When installing, orient the shade so this seam faces away from the viewer for best aesthetics.
The inner diameter of the shade is a bit smaller than the original shades, so you might want to get someone with smaller hands to help with the install if you are a guy with big hands.