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Print-in-place: barrel hinge, three knuckles, folds 180° (48.8 mm)

Name: Print-in-place: barrel hinge, three knuckles, folds 180° (48.8 mm) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do you 3D print a hinge already assembled? · Hardware · basis: Xem Studio design: 45° cone pivots on a horizontal axis; one designed running gap of 0.40 mm

Also called: print in place hinge, 3d printed hinge no assembly, print in place barrel hinge, folding hinge stl, cone pin hinge

Exact dimensions. True size, with no printing tolerance added.

length: 48.8 mm
width: 70.0 mm
height: 10.0 mm

Notes

3D print in place — prints already assembled, moving, in one job. Drawn at true size with no printer tolerance added; the 0.40 mm running gaps are part of the design.
Running gap 0.40 mm per side, 0.80 mm on diameter — part of the design, drawn as is. On the 45° faces the same 0.40 mm is measured square to the face (0.57 mm along the axis).
Bed: opened flat, both leaves on the bed, the barrel axis horizontal 5 mm up. Each knuckle stands on a flat foot: below 45° the barrel's round is replaced by 45° tangents down to the bed.
Support while printing: the pivots are 45° cones on the axis (the outer knuckles' cones point into sockets in the centre knuckle), and a 45° cone on a horizontal axis never overhangs more than 45°. Leaves and barrels print as plain walls.
Captured by the two opposed cones: the centre knuckle sits between them, so it can neither slide along the axis nor drop out.
Freeing it: hold leaf A flat and lift leaf B slowly to 90°, back, then all the way over to 180°; repeat a few times.
Motion: leaf B folds 181.2° up from flat — over 180°, where the leaves lie face to face 0.8 mm apart — and 98.4° the other way; the stops are leaf on leaf (computed by turning the model).

Print-in-place: barrel hinge, three knuckles, folds 180° size chart

key	value	what
gap_mm	0.4	running gap per side on every moving interface (radial, axial, under captured parts) — part of the design, not a tolerance
hinge_l_mm	48.8	length along the axis
leaf_w_mm	35.0	each leaf, from the axis
leaf_t_mm	4.6	leaf thickness
knuckle_d_mm	10.0	knuckle (barrel) diameter
axis_h_mm	5.0	axis height above the bed
knuckles	3 (12 + 24 + 12)	outer two on leaf A, centre one on leaf B
pin_d_mm	6.0	45° cone pivot, base diameter (one each end of the centre knuckle)
socket_d_mm	6.33	cone socket at the knuckle face
fold_up_deg	181.2	leaf B about the axis, from flat (drawn) to the stop
fold_down_deg	98.4	the other way, from flat
gap_folded_mm	0.8	between the leaves' faces at 180°
mount_holes	2 × Ø4.5 per leaf

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Xem Studio

Print-in-place mechanism design (geometry computed in the generator)

web

Xem Studio design

Free files

★ Free files 3 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

print-in-place-barrel-hinge-180-assembly	The whole print as laid on the bed (2 bodies, already assembled); STEP keeps each moving body a separate solid	STEP · STL
print-in-place-barrel-hinge-180-leaf-a	Leaf A with the two outer knuckles and the two 45° cone pivots	STEP · STL
print-in-place-barrel-hinge-180-leaf-b	Leaf B with the centre knuckle and its two cone sockets	STEP · STL

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=print-in-place-barrel-hinge-180

Print-in-place: barrel hinge, three knuckles, folds 180° (48.8 mm), isometric render of a generated part — Render of print-in-place-barrel-hinge-180-assembly from the free STEP; not to scale.

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Questions

What is the pin of a print-in-place hinge?

There is no separate pin: each outer knuckle carries a 45° cone (Ø6 base) that runs in a cone socket of the centre knuckle, 0.40 mm clear square to the cone.

Does it fold flat?

Yes: at 180° the leaves lie face to face, 0.8 mm apart; the knuckles are 10 mm in diameter on 4.6 mm leaves.