Climbing Monkey — Classic Rope-Climbing Pull Toy

The classic rope-climbing toy: pull the two beads one after the other —

down and slightly outward, like milking a cow — and the monkey ratchets

up the cords toward the banana. Let go and he stays put. Slacken both cords

(or pull both beads gently outward at once) and he slides back down.

No springs, no glue, no moving parts. Each paw has a Ø2.4 mm channel

tilted 45° from vertical. At rest the cord kinks sharply at the bore's

two sharp exits — capstan friction locks the monkey in place. Pulling one

bead straightens that cord, the body rocks about the other (still-locked)

paw, and the freed paw is hoisted a step up. Alternate = climb.

Three printed parts:

• monkey.stl— 86 × 97 × 15 mm relief figure, prints flat on its back

• - banana.stl— ~96 mm spreader bar with centre hang hole, prints flat

• - bead.stl— print 2, Ø33 mm pull handles (above the choke gauge)

You supply: 2 × ~1.2 m of Ø1.25 mm linen twine (butcher's twine; any

~1–1.5 mm string works) + ~0.3 m to hang the banana.

Watch it climb: https://www.youtube.com/watch?v=FRPiWxPS_d4 

Assembly (5 min): stiffen the twine ends with tape, knot a stopper on

top of each banana tip hole, run each cord down through the paw channel on

its own side (in the top-inner opening, out the bottom-outer), through a

bead, stopper knot hidden in the counterbore. Hang the banana by a short

cord through its centre hole.

Different string? The attached .scadis parametric — set

channel_d ≈ 1.5 × cord Ø + 0.3and rebuild. Slipperier string (nylon

mason line) makes the slide-down easier; fuzzier twine grips harder.

Print: any PLA/PETG, 0.2 mm layers, ~15 % infill, no supports,

everything flat on the bed. All three parts fit one plate.

Safety: beads are Ø33 mm (above the Ø31.7 mm small-parts choke gauge),

no small detachable parts. Cords are long — supervise small children, as

with any string toy.