From the original author, someandy on Thingiverse (https://www.thingiverse.com/someandy),
Thingiverse model https://www.thingiverse.com/thing:140343:

"Open in Customizer, upload an image and check the Invert Colors box.

The Smile and Flower STLs were generated with a 1.5mm emboss height and sliced in Makerware with 0.2mm layers, 20% infill, and 3 shells.

For the colored layers, I used the z-pause feature on my printer and switched filament at 4mm"

See the original creation to understand about the filament colors.

I modified the source so that it can take a wider range of input files. I also added a brightness invert option, and a flip left-right option.

It will accept .PNG files as input. The file should be small - no more than 300x300. It took my computer about 20 minutes to process a 300x300 photo.

I created letters by using Photoshop to create a square canvas, 100 x 100 to 300 x 300, filled with black. Then add a white letter (or image) onto the canvas. To make the sides of the letter in the embossing stamp sloped a bit, blur the image - I used Gaussian Blur, at 1 to 3 pixels. I then flipped the image left-right, although you can now do this by checking the "flip" button. Save the file as a .PNG.

Input the file into the customizer or OpenSCAD. If it doesn't look right, tick the “invert brightness” checkbox. You can flip the image left-right with the “flip image” checkbox, if you need (for instance to make a letter face the right direction). 

Print Settings

Printer Brand:

Creality

Printer: 

Ender 3 Pro

Rafts:

Doesn't Matter

Supports: 

No

Resolution:

.2mm

Infill: 

25

Filament: Various PLA Various

Category: Art Tools