How to 3D Print Custom Lithophane Bookmarks and Phone Cases

Standard 3D printed lithophanes are typically engineered at 3.0mm to 3.5mm thick for backlit lamp frames and night lights. But by scaling relief depth down to 1.0mm – 1.4mm, you can print flexible, ultra-thin lithophane bookmarks, phone case inserts, and wallet photo cards that reveal detailed images when held up to a window or smartphone flashlight!

In this guide, we cover scaling relief heights for ultra-thin prints, selecting translucent filaments, tuning slicer toolpaths, and preserving photo detail.

1. Thickness & Translucency Guidelines

2. Flexible TPU vs Rigid PETG Materials

For bookmarks, flexible TPU 95A is the ultimate material. TPU can bend 180° inside a closed book without creasing or cracking. For clear phone case inserts, rigid white PETG or natural PLA provides clean structural support that slides easily behind transparent TPU case backs.

3. Slicer Optimization for Ultra-Thin Prints

• Force 100% Solid Infill: Hollow infill inside a 1mm bookmark leaves ugly internal grid shadows when backlit. Set infill percentage to 100%!
• Use Monotonic Top/Bottom Infill: Extrudes toolpaths in a single direction, preventing light banding streaks when held up to natural sunlight.
• Layer Height: Set layer height to 0.10mm or 0.12mm to provide 8–10 distinct gray shadow steps across a 1.0mm relief span.

Hardware Compatibility & Calibration Checklist

Achieving pristine surface quality and tight dimensional tolerances requires a well-maintained 3D printer frame. Check that your X and Y axis belts are tensioned to approximately 110 Hz – 120 Hz, verify that your Z-axis lead screws or belt drives are free of debris, and perform a PID tune on your hotend heater block to eliminate temperature oscillations that cause subtle horizontal banding on outer model perimeters.

Step-by-Step Slicer Profile Optimization

Before launching your final print job, review your sliced G-code preview in OrcaSlicer, Bambu Studio, or PrusaSlicer. Use the color-coded speed legend to inspect wall velocities—keeping outer wall speed constant across the entire part height ensures uniform surface gloss. Verify that seam placement is aligned to sharp rear corners or hidden inside inset geometry to preserve a smooth front face.

Hardware Compatibility & Calibration Checklist

Achieving pristine surface quality and tight dimensional tolerances requires a well-maintained 3D printer frame. Check that your X and Y axis belts are tensioned to approximately 110 Hz – 120 Hz, verify that your Z-axis lead screws or belt drives are free of debris, and perform a PID tune on your hotend heater block to eliminate temperature oscillations that cause subtle horizontal banding on outer model perimeters.

Step-by-Step Slicer Profile Optimization

Before launching your final print job, review your sliced G-code preview in OrcaSlicer, Bambu Studio, or PrusaSlicer. Use the color-coded speed legend to inspect wall velocities—keeping outer wall speed constant across the entire part height ensures uniform surface gloss. Verify that seam placement is aligned to sharp rear corners or hidden inside inset geometry to preserve a smooth front face.

Hardware Compatibility & Calibration Checklist

Achieving pristine surface quality and tight dimensional tolerances requires a well-maintained 3D printer frame. Check that your X and Y axis belts are tensioned to approximately 110 Hz – 120 Hz, verify that your Z-axis lead screws or belt drives are free of debris, and perform a PID tune on your hotend heater block to eliminate temperature oscillations that cause subtle horizontal banding on outer model perimeters.

Step-by-Step Slicer Profile Optimization

Before launching your final print job, review your sliced G-code preview in OrcaSlicer, Bambu Studio, or PrusaSlicer. Use the color-coded speed legend to inspect wall velocities—keeping outer wall speed constant across the entire part height ensures uniform surface gloss. Verify that seam placement is aligned to sharp rear corners or hidden inside inset geometry to preserve a smooth front face.