Every assembly below was converted from a STEP file by the Quidities pipeline. Open one to spin it, explode it, and pick parts against a live bill of materials — 14 assemblies available.
Small reference assembly from the NIST CAD-PMI-Testing corpus. Validated STEP AP242 input we use as our day-zero smoke target.
Open-source 6-DOF robot arm assembly. Larger than the NIST sample; used to exercise the viewer's mid-complexity render path.
TheRobotStudio's open-hardware 5-DoF tabletop robot arm — the SO-100 Follower used by Hugging Face's LeRobot framework. Apache-2.0; full STEP assembly authored upstream, 18 parts.
TheRobotStudio's SO-100 Leader — the hand-held teleoperation controller that pairs with the SO-ARM100 Follower. Apache-2.0; small (13 PRODUCT_DEFINITIONs) 5-DoF skeleton used as an input device, not a working arm.
TheRobotStudio's SO-101 robot arm — successor to SO-ARM100. Apache-2.0; full STEP assembly at STEP/SO101/SO101 Assembly.step.
Seeed Studio's open-hardware 7-DoF developer robot arm — Damiao 43-series motor variant. Full v1.1 STEP assembly with 3D-printed structural parts, CNC-machined aluminum links, and a parallel-jaw gripper.
Voron Design's Tap — an optical Z-probe that uses the toolhead itself as the probe via a flexure. The R8 revision is the current reference. Tiny assembly (~10 MB STEP, ~56 PRODUCT_DEFINITIONs) — fast to convert, recognisable mod in the 3D-printer maker community.
Voron Design's Stealthburner — the standard current-generation toolhead across Voron 2.4 / Trident / V0.2 builds. Combines the CW2 (Clockwork2) direct-drive extruder, a 5015-blower part-cooling assembly, and the LED-illuminated 'face' that gives the mod its name. ~25 MB STEP, ~88 PRODUCT_DEFINITIONs.
Voron Design's previous-generation toolhead (predecessor to Stealthburner). Direct-drive extruder + part-cooling shroud; many community Voron 2.x builds still run this. ~35 MB STEP, ~115 PRODUCT_DEFINITIONs.
TheRobotStudio's HOPEJr humanoid project — the 7-degree-of-freedom shoulder/elbow/wrist arm intended for a full humanoid build. Same lineage as SO-ARM100/101; SolidWorks-exported AP203 STEP. ~27 MB, ~47 PRODUCT_DEFINITIONs.
Open Lab Starter Kit's reference benchtop CNC router (V1 design). 3-axis gantry mill aimed at hobbyist + small-lab machining; structural aluminum + 3D-printed brackets. CERN-OHL-W-2.0 (weakly reciprocal), full STEP committed to the upstream repo.
Enactic's fully open-source 7-DoF humanoid robot arm — the Follower (the actuated arm; the Leader is a teleop replica). Full assembly STEP exported from SolidWorks 2025, distributed via the upstream's Google Drive manifest. DAMIAO-motor-driven; same robot-arm family as the SO-ARM / reBot demos but a contact-rich humanoid form.
A RepRap, fully-3D-printed build of the Positron V3 — the inverted desktop FDM printer that prints downward through a transparent heated glass bed and folds flat into a filament box. Audiotronix's printed-parts variant of KRALYN's machined Positron V3. Full assembly STEP (AP214) with 26 named sub-assemblies (MakerBeam XY/Z axes, motor mounts, toolhead, bed holder, screen, base panels).
Voron Design's reference CoreXY 3D printer (Trident variant — three-Z, AB-belt-driven gantry). Full assembly STEP packaged by VoronDesign; the gold-standard reference build the maker community uses as the upstream truth for the printer.