To print these designs, you can use your regular slicer settings. All the models are pre-oriented and can be printed without supports. Print them in two colors of pla/petg to achieve a stunning two color effect, or do a few color swaps at the correct heights. My printer has terrible clearance (I haven't calibrated it yet) and I wanted my parts to slide effortlessly together, so I chose a clearance value of 0.7mm (quite large). If you notice that the parts are too loose you can adjust this in the slicer by changing the horizontal expansion value to something like +0.2 for a 0.5mm clearance (0.7-0.2). But even if the parts are very loose, the impossible passthrough illusion should work just as well.

Check out the design process here and see how you can also create these incredible passthroughs yourself: [https://www.instructables.com/DIY-Impossible-Passthrough/](https://www.instructables.com/DIY-Impossible-Passthrough/)

View and download the design on printables: [https://www.printables.com/model/1022866-impossible-passthrough-starter-pack](https://www.printables.com/model/1022866-impossible-passthrough-starter-pack)