Hello!
Keeping with my animal theme, my impossible 3D-printed object is an articulated kangaroo! It has Hinges/interlocking features which makes 3D printing the most viable option to produce it. You can check it out on Thingiverse here: Articulated Kangaroo – Thingiverse
To determine the correct size for the gumball capsule (approximately 1.8″ in diameter), I scaled down the default kangaroo model (originally ~3.5″) using the X-axis as my reference point, allowing the Y and Z dimensions to adjust proportionally. I printed four different sizes: X = 2”, 2.3”, 2.5”, and 3”. I expected the kangaroo would need to bend slightly to fit, but wasn’t sure how much flexibility the joints would allow without compromising structural integrity.
I used the Bambu FDM printer for initial testing, adding minor supports to assist with joint printing. After some trial and error with infill density and layer height, I found that X = 2.3” offered the best balance between fit and durability. The tail—being the longest and least flexible part—was the main constraint in determining the maximum size. On the Bambu FDM, I printed two more X = 2.3” kangaroos with PLA.
After settling on the ideal dimensions, I used Prusa software to reprint two more kangaroos at X= 2.3”. Though the Prusa prints took longer and initially struggled with bed plate calibration, I resolved the issue and successfully printed the final models. I used tweezers to clean up smaller supports from both printer types.
In total, I now have five printed kangaroos. The process was smooth overall (aside from the initial in-fill issue), and I’m excited to continue using 3D printing in future projects!
Cost Analysis:
- 3D Printer Worker: 5 hrs × $23.09 = $115.45
- 3D Printing Filament: $28.49
- Total: $143.94
Cleaned Workspace
