3D Object Joiner

straw + printed-node splicer — runs entirely in your browser

Demo object

Or upload your own

The knobs Coarseness fine, many parts → chunky, few parts 0.4 Fidelity loose, fewer unique prints → exact, more unique prints 0.6 Detail follows shape members all one size → short members on the detail 0

Coarseness sets how big members are relative to the model — part count and, since members are a fixed length, the finished size.

Fidelity is the accuracy-vs-effort trade. Lowering it lets nodes drift slightly off the surface and lets nodes that are nearly the same share one printed design, so you print fewer distinct parts.

Detail follows shape spends nodes where the shape actually turns instead of spreading them evenly, so detailed areas get short members and flat areas get long ones. It only pays off if you have ticked members of more than one length — with a single length there is nothing for the short edges to become. It does not change the node count; that stays Coarseness’s job. Leave it at 0 for even, repeatable parts: on a sphere, even is the honest answer.

Members (tick each length you will use)

	full length	cut in half
Kraft straw 197mm stock	full 177mm	half 79mm
Cocktail straw 130mm stock	full 110mm	half 45mm
Black plastic straw 130mm stock	full 110mm	half 45mm
Popsicle stick 114mm stock	full 94mm	half 37mm
Bamboo skewer 150mm stock	full 130mm	half 55mm
Toothpick 65mm stock	full 45mm	half 12mm

The mm figure is node spacing — member length minus what each end gives up to its connector. Spacing sets the minimum build size: a closed shape is at least ~2 spacings across.

Build size Target a finished height Target height (mm) 1500

Solves for the member cut length that hits this height. Off, members stay at uncut stock length.

Saved setups

Save current settings as

Kept in this browser only — nothing is uploaded. An uploaded STL is not part of a setup; re-pick the file after loading one.

Advanced

Override the two knobs

Unchecked, everything below is derived from Coarseness and Fidelity and is ignored.

Solve & dedup Run projection solve Connector length tolerance (mm) 5

Nodes whose stubs agree within this (and the angle tolerance) share one printed design, so this is also how far a built joint can sit from the ideal. Bigger means fewer designs to print.

Angle tolerance (deg) 8

Connector calibration

These two are guesses until you measure them. Print a calibration comb to find the right values for your printer and your actual stock.

Boss diameter offset (mm) 0.3 Sleeve clearance (mm) 0.3 Sleeve wall (mm) 1.5 Engagement per end (mm) 10

Node body Hollow node core Shell wall (mm) 1.2

Stock dimensions (reference)

Kraft / cocktail straw	6.0mm OD, ~0.4mm wall → 5.2mm bore
Black plastic straw	6.0mm OD, ~0.25mm wall → 5.5mm bore
Popsicle stick	9.4 x 2.1mm
Bamboo skewer / toothpick	3.0mm / 2.0mm round solid

Straws are spec'd by OUTER diameter — the boss fits the smaller bore, so thinner-walled plastic gets a wider boss. The plastic wall is an estimate; measure yours before printing.

Loading geometry engine…