Open-Source Download Center
Order Assembled Kits on Etsy
All kits are precision-manufactured in solid matte polymers with recessed legends 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) |
Durable 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, 41-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).
Master Teacher Guide & K–12 Student Lab Workbook
Book 1: 50-page Unified Master Teacher's Guide by Concept. Book 2: 29-page K–12 Hands-On Math Lab Student Workbook (with Self-Check Answer Key), plus 12 standalone 4-page Unit Packets.
Middle School Math Block Supplement & Workbook
128-page two-method practice workbook: 10 units, 45 textbook sections, 90 worksheets, and 900 practice problems bridging physical math blocks with middle school algorithms.
Student Proficiency Time Trials
21-page spiral timed sprint workbook (15 Sprints + Self-Check Answer Keys + RPN Speed Tactics & Certificate) modeled on UIL speed rounds.
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.
Middle School Math Lab Workbook & Master Teacher Guide
115-page Spiral Two-Method Student Practice Workbook (pp. i–iv + 1–111), 10 separate printable Chapter PDFs, + Unified Master Teacher & Homeschool Guide (Book 1).
Curriculum Alignment Matrix
Cross-reference matrix matching every StackCalc tool and key sequence to Bridges, Big Ideas, Singapore Dimensions, and CCSS.
Print Individual Chapters, Units & Lulu Coil-Bound Cover PDFs
To make home, classroom, and print-shop binding effortless, every unit of the Big Ideas Math Middle School SC-6 Supplement (Units 1–10) and the K–12 Teacher Curriculum Guide (Units 01–12) is pre-compiled as a standalone PDF packet, and our Lulu Coil-Bound Front & Back Covers (8.5" × 11" + 0.125" bleed) are available below:
- Big Ideas Middle School Chapter PDFs (Units 1–10, 10–12 pp. each): Unit 1: Numerical Expressions • Unit 2: Fractions & Decimals • Unit 3: Ratios & Rates • Unit 4: Percents • Unit 5: Algebraic Expressions • Unit 6: Equations • Unit 7: Area, Surface Area & Volume • Unit 8: Integers & Coordinate Plane • Unit 9: Statistical Measures • Unit 10: Data Displays
- K–12 Teacher Curriculum Unit PDFs (Units 01–12, 4 pp. each): Unit 01: Ten-Frames • Unit 02: Number Bonds • Unit 03: Number Rack • Unit 04: Counting & Arrays • Unit 05: Place Value • Unit 06: 84mm Fractions • Unit 07: Expression Trees • Unit 08: Algebra Factoring • Unit 09: Modulo-60 Clock • Unit 10: Probability Studio • Unit 11: Trig Volvelle • Unit 12: Calculus Integrals
- Lulu Coil-Bound Front & Back Cover PDFs (
8.75" × 11.25"with0.125"bleed &0.50"coil-punch safety margin): Book 1: Master Teacher & Homeschool Guide Cover • Book 2: Hands-On Math Lab Cover • Book 3: Middle School Math Lab Cover • Book 4: Stack Speed & Fluency Cover
2. Official Calculator Manuals, Spiral Workbooks & Machine-Readable Specs (Print & .JSON)
Official reference manuals, spiral-bound curriculum workbooks, structured JSON operational datasets, and view-only OpenAPI 3.1 specifications. Our flagship books are available in paperback and hardcover on Amazon (SC-32 Paperback ↗ • SC-32 Hardcover ↗ • SC-6 ↗ • Middle School Workbook ↗), and our coil-bound lay-flat spiral curriculum books & workbooks are published on Lulu Press ↗.
Order coil-bound lay-flat curriculum workbooks on Lulu Press or bookstore paperback/hardcover textbooks on Amazon.
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.
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.
OpenAPI 3.1 & JSON Datasets
View-only machine-readable specification and structured JSON operation rubrics for AI agents, automated grading, and developer tools.
3. 3D Printable Math Manipulatives & Hardware on Printables
All StackCalc 3D models, Gridfinity storage bins, and calculator chassis parts are hosted 100% free and open-source on Printables.
Instead of charging for digital STL downloads or maintaining large ZIP files, we publish pre-sliced multi-plate .3mf files (for Prusa, Bambu Lab, and OrcaSlicer) and single-part STLs directly to Printables.
Printables Collection: @StackCalc_5593834
Free, verified community models with full print profiles, community makes, and 1-click single-part replacement files for classroom 3D printing.
| Instrument | Focus & Grade Level | Gridfinity Envelope | 3D Model Destination |
|---|---|---|---|
| Place Value Studio & Regrouping Trays | Grades 1–5 • Place Value & Decimals | 3x1 Bin + Snap Lid | Printables Model Page ↗ |
| Fraction Studio Proportional Towers | Grades 3–8 • Equivalence & Decimals | 3x1 Bin + Workbench Lid | Printables Model Page ↗ |
| Prime Factor Studio & Factor Towers | Grades 3–9 • Factorization & Logarithms | 3x1x13U Bin + Slide Stage | Printables Model Page ↗ |
| Ten-Frame Dual Stage & Carry Shelf | Grades K–3 • Base-10 & Regrouping | 3x1 Bin + 2U Carry Cube | Printables Model Page ↗ |
| Counting Tiles & Planar Array Studio | Grades K–6 • Cardinality, Arrays & Maps | 3x1 Bin + 12-Tile Lid | Printables Model Page ↗ |
| Math Domino Studio & 12-Frame Set | Grades Pre-K–4 • Doubles & Pips | 3x1 Bin + Doubling Lid | Printables Model Page ↗ |
| Sectional Classroom Planetary Clock | Grades K–5 • 12:1 Gear Kinematics | 2x1 Stand + Quadrants | Printables Model Page ↗ |
| Algebra Factoring Studio & Tiles | Grades 7–12 • Quadratic Factoring | 3x1 Bin + 90° Area Stage | Printables Model Page ↗ |
| Probability Dice & Spinner Pack | Grades 4–12 • Dial Distributions | 1x1 Modular Pocket Bin | Printables Model Page ↗ |
| Unit Circle Trigonometry Volvelle | Grades 9–12 • Degree/Radian Apertures | Pocket Dual-Disc Assembly | Printables Model Page ↗ |
| SC-6 Quest Scoreboard & +10 Token Kit | Grades K–8 • Multi-Method Mastery (?) |
3x1x7U Open Bin + Scoreboard | Printables Model Page ↗ |
| Modular Stands & Desk Pouches | All Grades • 3-in-1 Puzzle Stands | 1x1 & 2x1 Desktop Stands | Printables Model Page ↗ |
| SC-32 Hardware Chassis & Keycaps | Makers • Tool-Free Dovetail Chassis | 5-Minute Snap Enclosure | Printables Model Page ↗ |
Don't Have a 3D Printer?
For schools, teachers, or parents who don't have access to a 3D printer: - Order On-Demand from Slant 3D: Our official manufacturing partner produces matching replacement parts, individual block refills, and classroom sets on industrial additive manufacturing farms: Slant 3D Portal ↗ - Order Handcrafted 3D-Printed Manipulative & Hardware Kits on Etsy: Handcrafted 3D-printed manipulative block kits and pre-soldered calculator hardware kits ship within 48 hours: Etsy Storefront (stackcalcmath.etsy.com) ↗ - Order Spiral-Bound Curriculum Books on Lulu & Print Textbooks on Amazon: Lay-flat coil-bound curriculum guides and workbooks are on Lulu Press ↗, and flagship books are on Amazon for SC-32 (Paperback ↗ • Hardcover ↗), SC-6 ↗, and the Middle School Math Blocks Workbook ↗. - Follow Hardware Build Logs on Hackaday: For KiCad PCB schematics, RP2350 silicon bring-up, and engineering discussion: Hackaday Project ↗ - View Full Refill Instructions: Read our dedicated Replacement Parts & Refills Guide.