This was designed to hold an outer curved lithophane in a standard nightlight.

Most generic nightlights will have a lightguard or shield which snaps into place. This was designed to replace that, snapping into place and holding a curved lithophane.

I print this out at 100% scale with at least 25% infill and minimum of 3 walls.

For the lithophane, visit http://3dp.rocks/lithophane and choose Outer Curve, with the default curvature settings and upload a photo. (NOTE: Please read up on Lithophane building first. Many people accidently create lithophanes that look like photo-negatives when they light up. Instead, they should look like photo-negatives when NOT lit up, then positive imaged when backlit.)