MODULE 19 / PRINTING & ASSEMBLY
Choose the right build files
Trace an individual component from the published BDX-R assembly into a clearly labeled candidate print file. Learn why simulation meshes, CAD sources and slicer projects serve different purposes.
By the end, you can…
- Classify STEP, STL and 3MF files correctly.
- Exclude purchased components from the print list.
- Export one candidate with an explicit unit and revision check.
Printer first steps
The CAD exploration module and a working CAD installation
Three files, three different jobs
STEP stores CAD geometry and can preserve separate solids and assembly relationships. It is a useful starting point for measuring a mechanical part or making a controlled revision. STL stores a triangle surface; it usually does not tell you the intended units, material or printer recipe. A smooth-looking cylinder in an STL is still approximated by flat triangles.
3MF is a container format that can hold multiple objects and richer information. A Bambu Studio project can retain model placement, filament assignments and slicing settings. A generic 3MF does not necessarily contain a complete compatible printer recipe. Open it, inspect it and re-slice for your hardware. Keep editable CAD beside your project so future design changes do not depend on repairing triangles.
What the actual BDX-R sources contain
The pinned BDX-R-CAD revision contains BDX-R V1.step, a README and an MIT license. The STEP is an assembly source, approximately 94.8 MB. We have not established a complete, certified BDX-R print pack with materials, orientations and slicer profiles. Downloading the assembly is the beginning of preparation.
The pinned description repository has 81 STL files, including 16 named motor representations, a battery and an IMU. These help represent the robot in software. Printing a motor-shaped mesh does not produce a motor. Even promising names such as a cover or bracket need comparison with CAD, dimensions, mating parts and the chosen robot revision. A filename alone cannot approve manufacturing.
Build a trail from source to physical part
Give each candidate a stable part ID and keep original downloads unchanged. Record repository, commit, source object name, intended quantity, material status and exported filename in the workbook. Separate confirmed facts from proposed choices. A repair or scaling operation creates a derivative that needs its own name and explanation.
Keep the upstream MIT copyright and permission notices with copied source geometry. The description repository also contains a nested MIT notice; preserve relevant notices instead of replacing everything with a generic credit. This is a practical provenance record: it helps you and another builder understand where a file came from and what you changed.
WORDS YOU NOW KNOW
- Mesh
- A surface represented by connected small polygons, usually triangles.
- Derivative
- A new file produced by exporting or modifying an existing source.
- Provenance
- The recorded origin and change history of a file or component.
YOUR CALL
Finished with this module?
0 of 8 lab steps checked. 0 of 3 questions answered. You decide when the module is complete. Revisiting or editing it will not change your decision.
You can reopen it later. Checking every box will not automatically complete it.Go to the source
Primary references for this module. Use the version and hardware revision named in the lesson.
Academy build files and download guideBDX-R assembly CAD — pinned revisionAssembly STEP source; requires component classification and manufacturing checks.BDX-R description meshes — pinned revisionIncludes purchased-component representations. Not a ready-to-print robot kit.Download the part registerBambu Studio — official feature overview3MF Consortium — model information in 3MFFreeCAD — supported modeling and file formats