Try This Articulated Nautilus: A Fun Flexi Print for Beginners
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If you've ever wanted to pull a model off your print bed that already wiggles, jiggles, and curls under its own weight, the articulated nautilus flexi print is the kind of project that makes 3D printing feel a little bit like magic. It comes off the build plate in one piece, tentacles waving, ready to play with.
The design, by maker Flexi JIMGA and shared on MakerWorld, is a clever twist on the classic "flexi" creature. Instead of one chunky body, it splits into a print-in-place tentacled core and a separate press-fit shell that snaps over the top. The articulated tentacles bend at each joint right off the printer, with no assembly, no glue, and no hardware. For a beginner who has only printed a few benchies and keychains, it's a great next step up.
What "print-in-place" actually means
A print-in-place model is designed so the moving parts are already separated by tiny gaps as the printer lays down plastic. When the print finishes, you give it a gentle wiggle and the joints break free. Nothing to assemble, nothing to screw together. The trick is in the gap size, usually around 0.2 to 0.3 mm, which most modern slicers handle out of the box at a 0.4 mm nozzle.
Slicer tips for clean joints
Flexi prints live and die by their joints. Stick with a 0.2 mm layer height for crisp detail on the shell and tentacles. Skip tree supports — flexi models are designed to print support-free, and adding supports can fuse the joints together. Keep your first layer slow and squished so the small tentacle segments don't pop loose, and turn your part cooling fan up after the first couple of layers to keep the overhangs sharp.
Try it on your printer
An Ender 3, Bambu A1, or Prusa MK4 with a stock 0.4 mm nozzle will handle this beautifully. PLA is the easiest choice — it's stiff enough for the press-fit shell and forgiving on bridges. If you want a rubbery, extra-flexible feel in the tentacles, drop in some TPU at 220 °C and slow your print speed down. Fresh, dry filament from Flarelab will keep stringing low and detail high on those tiny segments.
Frequently asked questions
Do I need supports for this nautilus?
No — flexi print-in-place models are designed to print without supports. Adding them will likely fuse the joints together and ruin the articulation.
Will PLA work, or do I need TPU?
PLA works great and is the easiest choice for beginners. The articulation comes from the geometry, not the material. TPU will give a softer, rubbery feel but is trickier to print.
What layer height should I use?
A 0.2 mm layer height with a standard 0.4 mm nozzle hits the sweet spot. You get clean tentacle joints without doubling your print time.
My tentacles are fused together — what went wrong?
Usually it's over-extrusion or a too-hot nozzle bleeding plastic into the joint gaps. Try lowering your flow by 2–3% and dropping the nozzle temperature 5 °C, and make sure supports are turned off.
Does the shell really press-fit without glue?
Yes. Print both parts in the same material so they shrink the same amount, give them a gentle push to seat, and the shell snaps right on. No glue, no hardware.
Inspired by reporting from Adafruit 3D Printing.