This is a demo print showing how to embed real glass into your prints to make truly transparent windows.

The example model will pause to allow you to insert a 75x25mm microscope slide. When you continue the print it will seal the slide in leaving you with a perfect window.

How to maker your own …

1. Create a negative object the size of your window glass (or acrylic or whatever your are using). You'll need to allow for the size calibration of your printer, shrinkage etc. For the nominally 75x25 slide printing with PETG on an X1 Carbon I used 76x26 and that was a perfect fit.
2. Create a second negative object slightly smaller in X and Y and the thickness of the model you are embedding into. This will be the size of the final window.
3. Align your “glass” so it is a suitable depth (the demo model is 3.9mm deep, the hole cutout is 4mm deep and the 1.1 mm slide is half way between top and bottom.
   
4. Important: Set your model to print inner then outer wall and make sure there are enough walls to cover the overlap of the “frame” (1mm in the demo). If you don't do this the slicer will try to print walls on glass, it won't stick and you'll end up with spaghetti (even with glue on the glass it fails more than half the time)
5. Slice and add a pause at the last layer before the edge of the glass is about to be covered.
   
6. When the printer pauses, insert the glass, hit continue and you're done.

Caution: Broken glass is sharp. If you cut yourself it's not my fault. Choose your window material accordingly and don't use glass on any model that will be used by children (or lawyers).