3D Printing & Modeling + Ed3DP
3. 3D Modelling- TinkerCAD
3.2. Design Project Tips
It is presumed that you are combining the 3D modelling in Tinkercad with 3D Printing, so most of these tips relate to easy, fast, successful 3D printing for classes with multiple prototypes for an introductory mainstream class (not a specialist design or extension class).
Project Design Tips:
- Small and Simple Designs:
- Its possible to not do any lessons using the TinkerCAD tutorials and just use Project Based Learning (PBL)- so keeping the design projects to about 1-2 hours of class time allows for repetition to consolidate TinkerCAD techniques.
- Simple basic shapes with vertical faces- for example making a ring for your finger is just two cylinders (hole + solid)
- "overhangs" are parts of the model or print job that do not have anything directly beneath and are defined as degrees from the vertical i.e. straight up is a zero degree overhang while a horizontal protrusion is a 90 degree overhang
- Limit overhangs to 30 degrees or 45 at most- this means that you don't need any "support" material when 3D printing and makes printing faster and simpler for beginners- so a pyramid has no overhangs while human with outstretched arms has lots of overhangs and is not suitable for beginners to 3D print
- Consider simple model rotation: for example a table standing upright would be horrendous to print but if you flip it so that the table top is on the bottom plane and legs sticking up then it would be simple to print with no overhangs
- such projects, for example a thin tall wall has a large surface area and a small volume so it dissipates heat quickly and unevenly which will cause "warping" and lifting of the print job from the print bed.
- "Squat" and "Chunky" models have low surface area to volume ratios and are thus less prone to warping and lifting issues.