Multiboard: the modular wall of points

You hang a tool off a pegboard and run straight into the system's limit: you can only anchor where there's a hole, and the holes sit on a fixed pitch that almost never falls where you want it. Multiboard targets exactly that. Instead of a grid of separate slots, it spreads a dense lattice of anchor points across the whole tile, packed close enough that an accessory fits almost anywhere, and each point grips with two mechanisms at once: an elastic snap that catches and a thread that tightens. It's a system designed and documented by its community, not an industrial standard, and that changes how you print it to be compatible: the values fall out of the geometry, but the exact dimensions of the point and the thread are fixed by its own specification, and that's where you need to go and look them up.

What it is: a wall of tiles with a lattice of points

Multiboard is a modular system in two layers. Below, square tiles that print flat and interlock along their edges to cover a wall or the bottom of a drawer; above, the accessories — hooks, baskets, holders, boxes — that anchor into the tile's lattice. What sets it apart from the classic pegboard isn't the idea of hanging things, but the density of the anchoring: the tile doesn't have a few big holes — it has a mesh of small points repeated with no dead gaps.

It works equally well as a vertical workshop wall or as a horizontal storage base. The difference isn't the system, it's the direction of the load: on a wall, gravity pulls the accessory downward, along the face of the tile, and the whole load runs through the anchor point. That makes the anchoring interface the critical part — and how you print it decides whether the assembly holds or lets go.

The lattice of points: snap and thread at once

The anchor points sit on a regular pitch on the order of 25 mm. Don't mistake that for continuous positioning: the position is still quantised to 25 mm, just as a pegboard is quantised to its own pitch. The advantage over a pegboard isn't an infinitely fine lattice, but two concrete things: the pitch is shorter than a Skådis (around 40 mm), and a medium-sized accessory spans several points at once, so it spreads the load and picks from more usable positions. Think of the lattice as a grid of coordinates: every point is identical to the one next to it, so an accessory designed for the pitch fits into any point on any tile with no preferred orientation.

The clever bit is how each point holds, because it combines two principles that used to be mutually exclusive. First an elastic snap: the accessory's connector has a geometry that flexes on the way in, clears a lip and closes back behind it, giving you that instant, tool-free catch. Then a thread that clamps against the same point and tensions the joint, taking out the play the snap leaves on its own. The snap positions and retains; the thread preloads. Together they turn a quick catch into a firm fixing, which is exactly what a wall with weight hanging off it demands: tool-free mounting, but no wobble once it's done up.

What changes for FDM: orientation decides everything

The snap is a press fit, and its stiffness — how much force it takes to flex and how much retention it offers — depends on two things you control at print time: the thickness of the elastic arm and the direction of the layers relative to the flex. This is central, not a finishing detail. An FDM part is strong along the beads and weak between layers, where only the thermal bond of the deposit holds it together. If you orient the connector so the snap flexes against the layer line — opening the bond plane between one layer and the next — every catch is pulling on the weakest joint in the part, and the arm cracks or snaps, almost always within the first few times you mount it. Turned the other way, with the flex running along the beads instead of prising them apart, the arm works where the material is strong. Print-friendly snap fits explains the physics behind that anisotropy and how to draw the snap to exploit it.

When the geometry forces some against-layer flex on you and you can't avoid it entirely, the process lever is inter-layer welding: raising the nozzle temperature and reducing cooling fuses each bead more firmly to the last, raising the strength of the weak joint. It doesn't turn the weak plane into a strong one, but it narrows the gap.

The same logic governs any hook you hang off the system. A wall hook works in bending: the load pulls on its root, and that's where it breaks. Print the hook with the load along the layers, not tearing them apart, and give it a generous fillet at the root. A hook laid on its edge, with the layer line crossing the root perpendicular to the load, delaminates under very little load; the same hook printed on the right plane holds several times more. The fillet isn't cosmetic: it spreads the stress concentration that, without it, piles up on the sharp corner of the root and peels the first layer off like opening a tin.

And there's a third variable every bit as decisive as orientation: the material at the root. A perfectly oriented hook, filleted, but hollow inside — two perimeters and 10% infill — still breaks at the root, because the load-bearing section is the wall, not the outline. On a loaded hook or connector, take the perimeters up to 4–6 in the root zone and don't drop below 30–40% infill; the load lives in the walls, so give them the thickness they need.

Material: why PLA fails under sustained load

PLA is convenient, stiff and dimensionally stable, which is why it's tempting to print the whole system in it. For the tiles, which work in compression against the wall, it's fine. For the connector and the hook, which carry a permanent load, it's the wrong material, and the failure mode doesn't show up on day one: it's cold flow (creep). Under a constant load at room temperature, PLA gives way slowly — the snap arm relaxes, the hook opens — and weeks later the accessory that held for the first ten minutes has lost its grip without anything having broken. A hot day or a wall in the sun speeds it up.

For anything that carries weight, use a tough material: PETG as the simple, available option, or ABS/ASA and nylon (PA) when you want more strength and thermal stability. It's also what the Multiboard community recommends for connectors. Toughness matters twice over on the snap: every time you mount it the arm flexes, and the snap only survives repeated cycles in a material that tolerates flexing. In PETG or nylon that arm flexes hundreds of times with no visible fatigue; in PLA, stiff and brittle, it cracks long before, even if you orient it well.

Clearance: the nominal connector comes out tight

As with any FDM interface, a connector printed at nominal dimensions comes out tight. The process bias always runs the same way: holes shrink and pegs and threads swell. The dominant driver is bead width biting into the curves, compounded by over-extrusion — and then contraction as it cools; first-layer squish (elephant's foot) tightens things too, but it only fattens the base of the peg, not its whole height. The physics behind this bias is set out in Holes, pegs and first-layer squish. The upshot: a peg drawn to spec in the model ends up a touch fatter in the part, a hole ends up a touch tighter, and the thread seizes or the snap won't go in.

For the snap and the peg, the fix is to add clearance per side and only convert it to diameter at the end: start from 0.1–0.2 mm per side in PLA — or whatever number you use in the tough material you've picked for the connector — and dial it in by measuring. The thread is another story and doesn't get corrected like a peg. Its clearance isn't a uniform "per side" offset; it lives in the flank diameter and the pitch, and you often have to reshape the profile rather than shift it. On top of that, layer height sets a ceiling: at 0.2 mm layers an FDM printer won't resolve a fine-pitch thread, which is why Multiboard's threads use a coarse pitch. Respect that pitch; don't fine it down "to get another turn in".

Don't tune by eye across the whole batch: print a single connector, try it on a real tile and confirm the snap catches and the thread does up before you print twenty. A tenth over or under is the difference between a catch that clicks and one that never closes, and finding that out on part number one costs ten minutes; finding it out on part number twenty costs the whole batch. The starting table by function and material, expressed per side, is in Real printed clearances.

Printing for compatibility, without surprises

Pull the decisions together and the system stops springing surprises on you. First orientation: place the connector so the snap flexes along the layers and the hook takes the load in that same direction, with a fillet at the root; that one decision separates an accessory that holds from one that delaminates. Second material and walls: PETG, ABS/ASA or nylon on any loaded part, with perimeters to spare and decent infill at the root. Third clearance: start from the spec for the geometry and open it per side to offset the bias, knowing the nominal always comes out tight. Fourth the test of one: validate a single connector on a real tile before you commit material and time to the batch.

It's also worth an honest note on compatibility: because it's a community system, variants and revisions coexist. If a tile printed by someone else won't fit your accessory, don't assume a design incompatibility before ruling out the obvious. The most common cause isn't the design, it's the printing: a wide, flat tile lifts its corners from contraction if the first layer doesn't adhere well, and a warped tile doesn't sit flush and shifts the lattice of points. Rule out warping, your printer's clearance versus theirs and the different versions of the profile first. Measure the actual point in front of you and check it against the spec before you readjust anything.

If you're coming from the pegboard and comparing anchoring philosophies, IKEA Skådis: the pegboard and its hooks gives you the contrast: a few big holes with hooks that hang by gravity versus this dense lattice that tensions every point with a thread. And for the heart of the matter — designing the snap to flex where the part is strong — go back to Print-friendly snap fits before you draw your first connector.