Connector Foundry
Open the app

Systems

Every mounting system in the catalogue: who made it, where it lives, where its community talks, which other projects model it, and which systems share a unit.

Connector Foundry recreates these systems; it did not invent any of them. Each entry links the designer's own pages first, then the community, then the other code that models the same standard, ours included. Where a part's geometry comes from, and under which licence, is in the README's "Where the geometry comes from" and "Licensing". The links were checked in November 2026. Printables, MakerWorld, Thangs and Reddit block automated checks, so their pages were confirmed by search rather than opened.

#Storage grids

#Gridfinity

A modular storage system for drawers and desks: bins that stand on a baseplate, on a 42 mm grid, with heights in 7 mm units. Zack Freedman released it in April 2022, partly inspired by Alexandre Chappel's Assortment System, and gave the design away under MIT, so anyone may make Gridfinity-compatible parts.

Gridfinity: Your Ultimate Modular Workshop is FREE! — Zack Freedman Plays from YouTube

#MOD-GRID

A pocket-sized tool grid for everyday carry: a 3 mm plate with 5 mm square holes on an 8 mm pitch, and accessories (bit holders, tools) that snap in with a two-peg pin. By Tiny Tool Shop (3dedc), CC BY-NC-SA 4.0. It shares its pitch with BitBeam and LEGO Technic.

MOD-GRID: Modular EDC Organization. — Tiny Tool Shop Plays from YouTube

#SOLDR

A modular, USB-C powered soldering station whose tool modules stand on a frame by tapered feet and magnets, on a 30.5 mm unit. By SNRGY Studios (soldr.pro), launched on Kickstarter in 2025; the printable modules are CC BY-NC-SA 4.0.

This Modular Soldering Workstation Fits in Your Pocket — SOLDR Plays from YouTube

#Wall and desk grids

#openGrid

A wall and desk mounting framework: thin tiles on a 28 mm grid, screwed to a wall or under a desk, that snaps, connectors and accessories clip into. By David D, first released in March 2025 under CC BY 4.0. It meets Gridfinity every 84 mm.

openGrid Intro – 3D printed open board ecosystem — David D Plays from YouTube

#Multiboard

A wall system of tiles on a 25 mm grid, by Keep Making (Jonathan K), now called MultiBuild: a threaded big hole in every cell and a threaded small hole at every corner between four, that bolts, snaps and pegs screw into. Its designs are under the MultiBuild Licence, which allows personal use only, no redistribution, and can be withdrawn, so no tile and no Multiboard part is in the catalogue. What is here only carries the tile's two threads, made from the community's measurements, so a part of ours screws into a tile and a hole of ours takes Multiboard's bolts.

  • In the catalogue: multiboard/snap (the big thread, under a head to fuse a part onto), multiboard/peg (the small thread); the Holes tab cuts both threads as the tile does. opengrid/multiconnect and the Holes tab's MultiConnect slot hang Multiboard's MultiConnect accessories. Both are parametric: the thread numbers are not yet checked against a printed tile.
  • Home: multibuild.io, and its licence.
  • Original files: on Thangs, under Keep Making and MultiBuild; the 8x8 core tile.
  • Community: r/Multiboard.
  • OpenSCAD: multiboard-parametric, whose measurements our threads use; multiboard-openscad, mb-tile-generator.
  • In the browser: Perplexing Labs' Multiboard hexgrid.

#GOEWS

The Greatly Over Engineered Wall System, by MrExo3D: tiles screwed straight to the wall, hexagonal cells 42 mm across their flats (each row 36.373 mm above the last and half a cell over) or GOEWS GRID's 42 × 36.373 mm rectangles, with no inserts or tile connectors. Every cell has a window; an accessory's hanger plate drops into it onto 45° cleats, and an optional M14 × 2 bolt through the plate locks it. Built on Gridfinity's 42 mm, so its shelves take Gridfinity bins. CC BY 4.0, with commercial use explicitly allowed.

#Honeycomb Storage Wall

A wall of hexagonal cells, 20 mm across their openings, that inserts clip into from the front. By RostaP, 2021.

#Skådis

IKEA's pegboard: a 5 mm board with 5 × 15 mm slots in a checkerboard on a 20 mm grid. IKEA publishes no specification, so its numbers are the boards' and the community's.

#Underware

Hands on Katie and BlackjackDuck's under-desk cable management: channels made of a base that mounts to openGrid, Multiboard or any flat surface (snap connectors, screws, magnets or tape) and a top that snaps onto it with no glue, sized in 25 mm units. Upstream's OpenSCAD generates straight, L, T, X, Y, S, C, mitre, diagonal and height-change channels, plus connectors, hooks and item holders. Here the straight and L channels are catalogue parts, base and top each, built from upstream's own channel profiles (lib/underware.scad), so the Holes tab can cut cable exits or screw holes into them and the Bench can fuse a hook or a connector onto a top's roof or a base's underside. CC BY-NC-SA 4.0, prints included.

David D's Underware for openGrid is the one-piece version for openGrid boards: no base, just a channel whose walls end in grips that snap straight into a board's cells, sized in openGrid's 28 mm cells. It comes first in the Library's Underware list. Its straight and L channels are built from Pedro Leite's OpenSCAD version, Monokini (lib/underware_opengrid.scad), and checked against both Monokini's scripts and David D's own files.

#Mounts and clips

#GoPro

The two- and three-prong buckle every action camera mount uses: Ø15 mm prong ends, 3 mm prongs, an M5 bolt through them. GoPro publishes no specification; the shape is what every mount agrees on.

#DeckMate

Mechanism's accessory mount, first for the Steam Deck: two halves, the Innie and the Outie, that slide together, and a three-hole screw pattern to fasten them to things. Mechanism publishes its own models (CC BY-NC 4.0).

How to 3D print and Assemble Deckmate, the Best Steam Deck Accessory! — Mechanism Plays from YouTube

#KLIPPT

A cable clip that slides onto a small base, stuck or screwed in place, and locks onto it. By FH (bequ3), CC BY-SA 4.0, the successor to their KLAMMA clip.

  • In the catalogue: klippt/base, klippt/clip_mount; the Holes tab cuts the clip's channel into any part.
  • Original files: KLIPPT on Printables, and the designer's other models, among them KLAMMA.

#MOLLE

The webbing grid on military and outdoor gear: PALS rows of 25.4 mm (1") webbing, 25.4 mm apart, stitched down every 38.1 mm (1.5"). Rigid MOLLE panels, as on vehicles, have no standard of their own.

#Camera

Two standards: the tripod screw (1/4"-20 on cameras, 3/8"-16 on tripod heads, ISO 1222), and the Arca-Swiss-style dovetail of quick-release plates, which no one has published as a standard and makers vary by tenths of a millimetre.

#MagSafe

Apple's magnetic ring on the back of an iPhone. Apple's own magnets are not for sale, so a printed mount holds an aftermarket magnet ring or a steel disk. Qi2's Magnetic Power Profile is the open standard built on it.

#Building systems

#BitBeam

Printable beams on LEGO Technic's grid: 8 × 8 mm beams with Ø4.8 mm holes every 8 mm, joined with Technic pins and axles. bitbeam.cc is Ondřej Tůma's continuation of Jason Huggins' original BitBeam, which descends from Grid Beam. It shares its grid with MOD-GRID, and lines up with Skådis every 40 mm.

#2020 extrusion

20 × 20 mm aluminium profile with a slot down each face, the frame of many 3D printers. T-slot and V-slot (OpenBuilds' design) differ in the slot's shape, and suppliers differ by tenths, so the fittings here are parametric.

#OpenSCAD in general

BOSL2 is what every part here is built on: its attachments are the slot convention. r/openscad is the place to ask about OpenSCAD itself. The basics/* parts belong to no system: plain plates, posts and a dovetail to build between the others.

#Shared units

Some systems were built on the same number, by design or by luck, and those line up without an adapter. Their grids, in millimetres:

System Grid Built from
Gridfinity 42 × 42 cells, 7 high 7 mm (6 × 7 across, 1 × 7 up)
openGrid 28 × 28 cells 7 mm (4 × 7)
GOEWS 42 across, rows 36.373 up (42 · √3/2) Gridfinity's 42 mm, across only
BitBeam and LEGO Technic 8 mm pitch, Ø4.8 round holes 8 mm
MOD-GRID 8 mm pitch, 5 mm square holes 8 mm
Skådis slots 40 apart along a row, rows 20 apart 20 mm
2020 extrusion 20 × 20 profile, one slot a face 20 mm
Multiboard 25 × 25 cells 25 mm
MOLLE 25.4 rows, 38.1 across inches (1", 1.5")
SOLDR 30.5 × 30.5 units —
Honeycomb Storage Wall hex cells, 20 openings, 20.44 across × 23.6 up —

#openGrid and Gridfinity: 84 mm

3 openGrid cells are 2 Gridfinity cells: 3 × 28 = 2 × 42 = 84 mm. Both grids are multiples of 7 mm, Gridfinity's height unit (28 = 4 × 7, 42 = 6 × 7), so they meet every 84 mm. A Gridfinity baseplate an even number of cells wide covers a whole number of openGrid cells, and so lines up with the board's cells behind it. openGrid's documentation lists Gridfinity among the systems it is compatible with, and David D's intro video has a chapter on it.

#GOEWS and Gridfinity: 42 mm across

GOEWS is Gridfinity's 42 mm across: one cell per Gridfinity cell, so a GOEWS shelf takes Gridfinity bins. Not up the wall: a hex tile's rows are 42 · √3/2 = 36.373 mm apart, and GOEWS GRID keeps those rows; only the "42H Legacy" square variant is 42 mm both ways. It has no use for Gridfinity's 7 mm height unit (a tile is 6 mm thick). Across, it meets openGrid every 84 mm as Gridfinity does (three openGrid cells, two GOEWS cells); up, its rows never meet openGrid's.

#BitBeam, LEGO Technic and MOD-GRID: 8 mm

BitBeam is LEGO Technic's grid: 8 mm from hole to hole and Ø4.8 mm holes, so Technic pins and axles go straight in (the catalogue's BitBeam pin and axle are Technic parts). MOD-GRID is on the same 8 mm pitch, and its 5 mm square holes take a Ø4.8 mm Technic pin with 0.1 mm to spare on each side. A MOD-GRID plate is 3 mm thick where a beam is 8 mm deep, and a Technic friction pin is made to grip an 8 mm hole, so a pin through a MOD-GRID plate locates a part exactly but holds it loosely. A BitBeam beam or plate and a MOD-GRID grid can be pinned together hole for hole.

#Skådis and the 8 mm systems: 40 mm

Skådis slots are 40 mm apart along a row, which is 5 × 8 mm: a BitBeam beam or a MOD-GRID strip laid along a row has a hole centred on every slot in it. The next row is shifted 20 mm, two and a half holes, so only every other row lines up with the same beam.

#Gridfinity and SOLDR: the same magnets

Gridfinity's magnet holes and SOLDR's are both Ø6.5 mm for Ø6 mm disc magnets. One bag of 6 × 2 mm magnets serves both.

#Near misses

Close enough to look compatible, far enough apart to drift:

  • Skådis 40 and Gridfinity 42. 2 mm a cell: after five cells a Gridfinity grid is half a cell off Skådis.
  • openGrid 28 and Multiboard 25. Different grids, though the MultiConnect connector fits both (openGrid's openConnect is made to be backwards compatible with it).
  • Multiboard 25 and the inch's 25.4 (MOLLE). 0.4 mm a cell: 4 mm out after ten.