Open-Source Download Center
Order Factory-Calibrated Kits on Etsy
All kits are precision-manufactured in Mil-Spec PLA 2.0+ with laser-foamed pips and ship in 48 hours with our lifetime "No Lost Piece Left Behind" guarantee.
Recommended Print Settings
Every part in the StackCalc ecosystem is engineered for consumer 3D printers, calibrated on Prusa MK3S+/MK4/MINI+ and verified with PrusaSlicer (also compatible with Voron, Ender-3):
| Parameter | Specification | Purpose |
|---|---|---|
| Nozzle Diameter | 0.40 mm (Standard) |
Optimal balance between fine key legends and print speed |
| Layer Height | 0.20 mm Standard (0.12 mm for keycaps/faceplates) |
Tight interlocking tolerances for sliding dovetails and Gridfinity |
| Supports | None (100% Support-Free) | All overhangs \(\le 45^\circ\); zero support removal scarring |
| Infill | 15% – 20% (Gyroid or Grid) |
Dimensional rigidity and acoustic resonance during desk drops |
| Material | PLA 2.0+ or PETG (Chassis), TPU 95A (Keys & Pouches) |
Mil-Spec Shore 70D impact resistance and 400g snap actuation |
1. Classroom Curriculum & Competition Downloads (.PDF)
Free downloadable teaching guides, pre-generated station companions, competition test booklets, and duplex reference cards designed for immediate classroom print reproduction.
Teacher Evaluation Kit & District Requisition Packet (.ZIP)
Everything required to evaluate StackCalc for school districts, math teams, or classroom pilots: includes the District PO Order Requisition Form (Net-30), IRS Form W-9 Vendor Onboarding SLA, 34-page Teacher Facilitator Guide, sample CPA math labs, 3 textbook station guides (Singapore, Bridges, Big Ideas), and a full Texas UIL tournament sprint test with scoring keys.
Classroom Station Guides & Worksheets
2-page visual station companions with CPA CAD blueprints and teacher rubrics for Singapore Dimensions, Bridges in Mathematics, and Big Ideas Math.
Texas UIL & TMSCA Competition Exams
Official 30-min tournament test booklets and 3-sig-fig grading keys for High School (SC-32), Junior High (Grades 7–8), and Elementary (Grades 3–6 on SC-6).
Curriculum Guide & Math Labs
Complete 43-page classroom manual with 20 hands-on STEM investigations, Singapore/Bridges/Big Ideas pacing tables, and teacher diagnostic keys.
Student Proficiency Time Trials
18-page timed sprint booklet modeled on UIL speed rounds with maximum stack depth constraints and scoring rubrics.
RPN Math Labs Sample (.PDF)
Complete sample unit covering Concrete-to-Abstract fraction towers, base-10 regrouping, and introductory RPN stack evaluation.
135×90mm Reference Cards (Master PDF)
Complete 20-page compilation of all 10 manipulative kits with high-contrast vector schematics, RPN keystrokes, and packing manifests.
Prime Factor Studio Unboxing Booklet
Printable 5.5×4.25 in tutorial booklet and 4-quadrant cross-fold manual sized for 7×5×2 packaging boxes. Step-by-step LCM & GCD lesson.
Curriculum Alignment Matrix
Cross-reference matrix matching every StackCalc tool and key sequence to Bridges, Big Ideas, Singapore Dimensions, and CCSS.
2. Official Calculator Manuals & Machine-Readable Specs (Print & .JSON)
Official spiral-bound bench reference manuals, structured JSON operational datasets, and view-only OpenAPI 3.1 specifications. Both manuals are published as $16.00 coil-bound spiral print editions engineered to lay 100% flat on laboratory desks.
Tear-resistant 32lb synthetic stock, water-resistant laminated covers, and continuous lay-flat wire coil binding.
SC-32 Scientific Reference Manual ($16)
Complete operational reference: 4-stack XYZT, numerical solvers (SOLVE, ∫, POLY, TVM), vector plotting engine, and Texas UIL contest speed tactics. 370 pages, spiral-bound flat-lay bench edition.
SC-6 Elementary Companion ($16)
Classroom and family companion: 4-stack XYZT secret, skip-counting [REP], [÷R] division remainders, concrete math block bridge, and math quiz engine. 387 pages, spiral-bound flat-lay bench edition.
OpenAPI 3.1 & JSON Datasets
View-only machine-readable specification and structured JSON operation rubrics for AI agents, automated grading, and developer tools.
3. All-in-One Maker STL / 3MF Bundles
Complete repository archives containing all models, stages, boxes, and lids in a single organized zip archive.
Learning Lab 0.2.0 Master STL Pack
Contains all 10 physical manipulative kits: Ten-Frames, Math Dominoes, Counting Tiles, Fraction Studio, Planetary Clock, Algebra Boxes, Prime Factor Studio, Probability Dice, Unit Circle Volvelle, and Desk Stands. Includes pre-sliced PrusaSlicer 3MFs.
SC-32 Mechanical Prototype STLs
Includes the 4-part interlocking sliding dovetail chassis, 43-key mechanical dome matrix carrier, battery door rails, and TPU travel pouch molds.
3. Individual Manipulative Kit Archives
Targeted STL archives for individual stations, replacement parts, or classroom prototyping:
| Instrument | Focus & Grade Level | Gridfinity Envelope | Direct Download |
|---|---|---|---|
| Fraction Studio Proportional Towers | Grades 3–8 • Equivalence & Decimals | 3x1 Bin + Workbench Lid | Download fraction-studio.zip (4.2 MB) ↓ |
| Counting Tiles & Planar Array Studio | Grades K–6 • Cardinality, Arrays & Maps | 3x1 Bin + 12-Miniblock Lid | Download counting-tiles.zip (783 KB) ↓ |
| Prime Factor Studio & Factor Towers | Grades 3–9 • Factorization & Logarithms | 3x1 Bin + Factor Lid Sockets | Download prime-factor-studio.zip (2.1 MB) ↓ |
| Sectional Classroom Planetary Clock | Grades K–5 • 12:1 Gear Kinematics | 2x1 Stand + Quadrants | Download classroom-clock.zip (12.5 MB) ↓ |
| Ten-Frame Dual Stage & Carry Shelf | Grades K–3 • Base-10 & Regrouping | 3x1 Bin + 2U Carry Cube | Download ten-frames.zip (1.3 MB) ↓ |
| Math Domino Studio & 12-Frame Set | Grades Pre-K–4 • Doubles & Pips | 3x1 Bin + Doubling Lid | Download math-dominoes.zip (772 KB) ↓ |
| Algebra Factoring Studio & Tiles | Grades 7–12 • Quadratic Factoring | 3x1 Bin + 90° Area Stage | Download algebra-boxes.zip (1.4 MB) ↓ |
| Probability Dice & Spinner Pack | Grades 4–12 • Dial Distributions | 1x1 Modular Pocket Bin | Download dice-spinner.zip (485 KB) ↓ |
| Unit Circle Trigonometry Volvelle | Grades 9–12 • Degree/Radian Apertures | Pocket Dual-Disc Assembly | Download unit-circle-volvelle.zip (4.5 MB) ↓ |
| Modular Stands & Desk Pouches | All Grades • 3-in-1 Puzzle Stands | 1x1 & 2x1 Desktop Stands | Download stands-and-pouches.zip (4.1 MB) ↓ |
Maker Hardware Pack Upsell
Printed your own plastic parts? You can purchase the official factory fastener and decal pack on Etsy for $19.00, including: * Custom laser-engraved anodized faceplates with micro-grooves * 400g snap-dome click switches and pre-soldered silicone feet * Pre-cut transflective LCD optical adhesive gaskets * High-tack reference card decals and archival kraft packaging