Week05
## A. Group assignment (Test the Design Rules for Our 3D Printer(s))
Group Assignment: Test the Design Rules for Our 3D Printer(s) We focused on understanding and testing the design rules of our 3D printer(s) to determine their real fabrication limits. Design rules define the minimum and maximum capabilities of a printer, MakerBot sketch is the one I used for this assignmnet and will work on other too:
1. Describe the 3D Printer (3D Printer: MakerBot Sketch)¶
| Parameter | Specification |
|---|---|
| Make & Model | MakerBot Sketch |
| Technology | FDM (Fused Deposition Modeling) |
| Motion System Type | Cartesian motion system |
| Build Volume | 220 × 200 × 250 mm |
| Nozzle Type | Brass nozzle |
| Nozzle Diameter | 0.4 mm |
| Max Nozzle Temperature | ~240°C |
| Max Bed Temperature | Non-heated bed (PLA optimized platform) |
| Compatible Material | PLA |
| Control Software | MakerBot Print |
| Control Electronics | Proprietary MakerBot control board |
| File Format | STL / MakerBot format |
| Enclosure | Fully enclosed build chamber |
| Build Plate | Removable flexible build plate |
2. Printer Characterization / Test Object¶
Test Model Used:
Complete 3D Printer Test – All-in-One Stress Test
https://www.printables.com/model/112181-complete-3d-printer-test-all-in-one-stress-test-be
3. Parameters Tested¶
| Test Feature | Purpose | Observation |
|---|---|---|
| Overhang Test | Determine maximum printable angle without supports | Evaluated angle performance (e.g., 45°, 60°, 70°) |
| Bridging Test | Test ability to print across gaps | Measured clean span distance |
| Dimensional Precision | Compare designed vs printed dimensions | Checked tolerance accuracy |
| Clearance Test | Measure minimum moving gap between parts | Identified functional tolerance (e.g., 0.2–0.4 mm) |
| Fine Detail | Test smallest printable features | Checked text and thin walls |
| Surface Quality | Evaluate layer consistency | Observed smoothness and layer lines |
| Artifacts | Identify ringing, ghosting, stringing | Inspected print defects |
| Wall Thickness | Determine minimum stable wall size | Measured thin wall performance |
4. Design Rules Identified (fromt test model)¶
- Minimum wall thickness: ~0.8 mm recommended
- Clearance tolerance: ~0.3 mm for moving parts
- Maximum overhang without support: ~60°
- Reliable bridging distance: ~15–20 mm
- Optimal layer height: 0.3 mm
5. My observation an dConclusion¶
The MakerBot Sketch performs reliably for PLA prototyping.
Best results are achieved when designs follow tested tolerances and overhang limits identified during characterization.
As a team, we designed and printed a test model by downloading from
https://www.printables.com/model/112181-complete-3d-printer-test-all-in-one-stress-test-be
(without any change to the test model dowloaded) that included different geometric features to evaluate these parameters with the help of our instructor Rico.
Downloading the model from the link attributed above and open in the MakerBot 3D printer app¶
Import the test model from the saved file and open in the MakerBot 3D printer app¶
Correct the setting before expeorting as the testing parameter requirement and correct in the MakerBot 3D printer app setting option¶
MakerBot Sketch, a desktop FDM (Fused Deposition Modeling) machine designed for reliable and user-friendly 3D printing. It uses PLA filament and features a fully enclosed build chamber, which improves print safety and temperature stability. In our lab, we use this printer to test design rules, produce prototypes, and validate 3D models before final production.*
For more machines in our center
This testing model is uploaded befor the currently used MakerBot 3D printers and all the parameters might be modified or changed.
Slice/set as needed and export to the MakerBot 3D printer (Sketch mini, in my case) to print¶
Printing¶
1. Sending to printer¶
After sliced the test model setting all the machenes starting procedure and sent to the 3D printer with flash disk and start to printing
I have Used printer the following 3D Makerbot sketch printer.
2. start printing¶
Check the printr start correctly to extrude the filamant
Check the printing progress
3. Final printed test model¶
Evaluate the models for the expected result, my final print tested mode had has the smalldeficit at the buttom face of the model > 80°, other paramethers looks better.
The final printed and local Instructor show me some of the printers to be corrected areas (Like Texts printed at the bottom have the defi)
I see the printer start @ 85° inclination start deficit (so, it needs supports at nearly 75 degree beneded designs to be printed)
It actual well printed, and next all the comment on text printing and other recommendation test will be done for all other printer in my center.
