About the ModelExperience the mesmerizing magic of 3D printing with this impossible passthrough fidget toy! Watch as the inner cone seamlessly spirals through the outer shell, creating a highly satisfying, smooth mechanical illusion.Perfect as an anti-stress desk toy or a showcase piece for your 3D printing capabilities.

Designed with perfect proportions: 80 mm in height and 50 mm in base diameter, making it comfortable to hold and play with.Premium feel: The entire model features 1 mm fillets on all edges, ensuring a smooth, tactile, and comfortable grip without any sharp corners.

Print SettingsThis model is highly optimized for flawless FDM printing and a satisfying mechanical fit.

Material: PLA, PETG, or Silk PLA (Silk filaments look absolutely stunning with the curved spiral reflections!).

Orientation: Print both pieces separately, standing vertically flat on their 50 mm bases.

Supports: Absolutely no supports! The overhang angles are designed to print cleanly as is.

Infill: 10-15% (Gyroid or Cubic).

Perimeters/Walls: 2 to 3 walls for structural rigidity.

Engineering Tips for a Perfect Print:

Perfect Tolerances: The model is engineered with a precise 0.2 mm clearance between the inner and outer parts. Ensure your printer is well-calibrated for dimensional accuracy to achieve that buttery-smooth sliding action.

Elephant Foot Prevention: No need to worry about the first layers fusing or sticking! A highly functional 0.5 mm chamfer is integrated into the bottom of the design specifically to counter elephant foot expansion, ensuring the parts fit together perfectly right off the build plate.

Z-Seam Alignment: For the smoothest rotation, set your Z-seam to Random or carefully align it to the sharpest inner corner. A thick, protruding Z-seam line might catch and prevent the two parts from sliding easily.

Explore My Profile!If you like this design, check out my profile for more high-quality 3D-printable accessories and educational toys! Don't miss my Professional TIG Welding Torch WP26 Style Engineering Accuracy . Your support helps me continue creating professional-grade, engineered models for the community!