The file 'Customizable Folding Greeting Card 3D Printer Model' is (stl,scad) file type, size is 233.6KB.
A print-in-place customizable-text greeting card with slotted middle section to allow folding. SCAD file included for you to customize text/size/position/embossment/heart/etc. Carefully heating the middle section with a hair dryer afterwards will allow for easier folding.
The slotted middle section was inspired by 10moralesa's design: https://www.thingiverse.com/thing:103755
In the sunflower version of the STL file, I've simply merged in EnochLima's sunflower design using PrusaSlic3r:
https://www.thingiverse.com/thing:3375686
Consider changing filament color during the print to highlight embossed/debossed text or objects (or color in with paint or sharpie).
UPDATE 6/19/20: Updated SCAD file to allow text strings to be modified using Customizer, versus manually editing the SCAD file.
UPDATE 8/16/20: Updated SCAD file to fix an issue with inside text depth being half of that specified, to allow front text to optionally be debossed, to allow heart position to be modified, and allow more lines of text.
greeting-card-with-sunflower.stl | 562.9KB | |
greeting-card.scad | 4.6KB | |
greeting-card.stl | 989.1KB |