ID Card Holder – Patterns

A slim, rigid holder for your work badge, with a back that is more than just plastic. This holder takes any card in the standard ID-1 size (85.6 × 54 mm, like bank and work ID cards) and keeps it flat and protected. The card stays visible behind a large front window and can still be read by RFID readers. A slot at the top fits standard badge clips, lanyards and badge reels, and two round holes take a key ring or carabiner. The back comes in six versions: plain, honeycomb, Voronoi, asanoha, Truchet and topo. Features - Fits ID-1 cards up to 1.0 mm thick (most work and access cards), portrait and landscape

- Holds the card on three sides: a 45° edge on the left, right and bottom keeps the card in place without clips or detents

- Easy to swap cards: flex the card slightly and slide it in through the opening at the top, in front of the clip slot

- Clip slot 15 × 3.5 mm for badge clips and reels, plus two 5 mm ring holes

- Slim: 59 × 102 × 3.4 mm (portrait), 91 × 70 × 3.4 mm (landscape)

- Support-free: no overhang steeper than 45°, prints flat on its back

- Parametric: OpenSCAD source included

Back Type Look

Plain solid clean, single color

Honeycomb cutout or inlay 6 mm hexagons

Voronoi cutout or inlay organic cells

Asanoha cutout or inlay Japanese kumiko star pattern

Truchet inlay only random quarter-circle tiles that form endless curves

Topo inlay only contour lines like on a hiking map

Cutout: the pattern goes through the back wall, and the back of your card shows through. Single color, no MMU needed. Inlay: the pattern is a second color, flush with the back (0.6 mm, 3 layers). Needs a multi-material printer or a manual filament change. In PrusaSlicer, load …-holder.stl, then right-click it → Add part → …-color.stl, and give each part its own filament. Truchet and topo only work as inlays: as cutouts, their islands would fall out. Printing - Back side down, exactly as the STL is placed

- PETG (or PLA), 0.2 mm layers, 100 % infill (or 3 perimeters, it comes out solid anyway)

- No supports, no brim

- Smooth PEI gives a glossy back, a textured sheet a matte one

- About 7–13 g per holder, depending on the back

Inserting the card - Flex the card slightly.

- Push it in with its bottom edge first through the opening at the top, under the side edges.

- Slide it down until the top end drops in front of the clip slot.

To remove it, lift the top end of the card in the opening and pull it out. Make it yours Everything is generated by the OpenSCAD files id-card-holder.scad and patterns.scad (included, works in the OpenSCAD Customizer). At the top of id-card-holder.scad you can change: - format: "portrait" or "landscape"

- back: plain, honeycomb, voronoi, asanoha, truchet, topo

- back_style: cutout or inlay

- pattern_seed: a different number gives a new random Voronoi, Truchet or topo pattern

- card_thickness and slot_gap: for thicker cards (keep slot_gap a multiple of 0.2 mm)

- part: holder, or inlay for the second-color part

Example: openscad -D 'back="voronoi"' -D 'pattern_seed=42' -o my-holder.stl id-card-holder.scad About the images The images are renders made in Blender from the STL files. The sample card ("Nordhafen Labs") is fictional.