POLPO Articulated Octopus: 8 Curling Tentacles, 56 Joints, Print-in-Place, No Supports, Multicolor Ready

A chunky, googly-eyed octopus that comes off the bed in one print with all 57 parts already linked. Pick it up and the tentacles swing, curl and wrap around your fingers. Every tentacle has 7 segments that get smaller toward a curled tip, with raised suckers on top. It works as a desk toy, a fidget and a kids' gift. It also makes a good test print for a new printer: it prints in one go and either works or it doesn't. Single color looks great. With an MMU or AMS, the three multicolor files give you white suckers and eyes with black pupils. Engineering Print-in-place: 57 parts, 56 joints, no supports. Each joint is a round pin with a 45° V-shaped ridge, sitting in a C-shaped socket with 0.4 mm clearance. The ridge keeps the pin from lifting out of the socket. The pin can't pull out. The socket mouth is 0.7 mm narrower than the pin, so pulling a tentacle doesn't take it apart. Only the neck passes through the mouth. Range of motion: each joint swings freely by ±24° at the head down to ±18° at the tip, so one tentacle can curl about 150°; past that, a hard stop takes over at about 32–36°. No collisions inside the free range. Each segment's outline was swept through its full swing and cut out of the segment closer to the head, so the tentacle never jams on itself. Verified in CAD before release: 57 separate bodies with zero contact as printed; every joint is clear across its full swing; lifting a pin 1 mm or pulling it 1 mm hits the socket; overhangs over 45° add up to under 1 mm² per part. Print: 180 × 180 × 24 mm. Fits the Prusa MK3S; on the MINI+ it just fits (179.5 mm). On the MK3S it takes about 4 h 25 min and 32 g of PLA (0.20 mm, 15% gyroid); on the MINI+, about 4 h. Print flat as oriented, with no brim and a clean first layer. The joints rely on zero stringing: one hair across a socket fuses a joint. After printing: flex each tentacle joint by joint, from the head out, until it moves freely.