Terbium
Terbium 3D Printer Journal
Repo: github.com/akulsaju/terbium
CAD Hours: “99h 23m”
February 10, 2024
Task: Project Planning
Time: 20 minutes
Notes:
- Defined core objectives: affordability, modularity, and compatibility with standard components.
- Researched frame materials and motion systems (Cartesian vs. CoreXY).
February 11, 2024
Task: Preliminary Research
Time: 1 hour
Notes:
- Reviewed open-source printer designs (Prusa i3, Ender 3) for inspiration.
- Selected GT2 belts and NEMA17 motors for cost-effectiveness.
February 14, 2024
Task: Component Sourcing Plan
Time: 3 hours
Notes:
- Drafted initial BOM with AliExpress parts:
- Motion: MGN9C rails, 8mm linear rods, LM8LUU bearings.
- Electronics: 24V PSU, BLTouch, modular mainboard.
- Highlighted risks: inconsistent motor specs, rail tolerances.
February 16–18, 2024
Task: CAD Modeling (Frame & Y-Axis)
Time: 15.5 hours
Notes:
- Frame: Designed 2020 aluminum extrusion structure in Onshape.
- Y-Axis:
- Dual 8mm linear rods with LM8LUU bearings.
- Unit error discovered (cm instead of mm), requiring full redesign.
- Implemented spring-loaded GT2 belt tensioners post-correction.
February 21, 2024
Task: Y-Axis Optimization & Bed Design
Time: 5.5 hours
Notes:
- Adjusted pulley alignment to prevent belt derailment.
- Modeled 210x210mm heated bed with silicone thermal pads.
February 22–23, 2024
Task: Z-Axis & Printhead Development
Time: 6 hours
Notes:
- Z-Axis: Switched from lead screws to belts due to wobble in simulation.
- Printhead: Designed modular mount for Bambu X1-style hotend with dual 4010 cooling fans.
February 26–28, 2024
Task: Thermal & Structural Analysis
Time: 5.5 hours
Notes:
- CFD: Revised fan ducts to reduce turbulent airflow.
- Frame Rigidity: Added cross-bracing to reduce resonant vibrations.
March 1–5, 2024
Task: Motion System Refinement
Time: 11 hours
Notes:
- Upgraded to fiberglass-reinforced GT2 belts to minimize resonance.
- Integrated 3:1 gear reduction for improved motor torque.
March 7–20, 2024
Task: Final Assembly Checks
Time: 10 hours
Notes:
- Adjusted X-axis carriage to prevent collisions with Z-axis brackets.
- Validated bed leveling mechanism (±0.1mm precision).
Overall
- CAD Hours: “99h 23m”
- BOM: “https://docs.google.com/spreadsheets/d/1OlRZbKyhsi1nM5R4tDLmwMiiqEgzE4qpPp_ct5iw9p4/edit?usp=sharing “
Terbium: Because buying a printer is for nerds with money. 💸🔥
Pics
