Print Orientation
Many of these devices require some attention when printing. Because 3D printers fabricate objects from thin layers of plastic, there is a grain to the structure of the printed parts, much like there is grain in wood. Many of the parts used in the e-NABLE hands need to be printed in a particular orientation so that the “grain” of the print is oriented to maximize the strength of the part.
For instance, most gauntlet designs need to be printed with the two arms in contact with the build platform. While this does require some amount of support material, it aligns the layers of the print with the directions of loading during use.
Materials
Materials are still an area of active exploration. e-NABLE members are currently fabricating hands using ABS, PLA, and Nylon, each of which has specific printing requirements.
Branebot put together a great Instructable describing the process of printing a Cyborg Beast in Nylon and dying it.
Recommendations for PLA:
- Extruder: 180-230C (depends heavily on type of machine)
- Bed: 0-60C
Recommendations for ABS:
- Extruder: 230-240C (depends heavily on type of machine)
- Bed: 80-110C
Recommendations for Nylon:
- Extruder: 240C
- Bed: 80C (PVA/Elmer’s glue stick helps with adhesion)
- Retraction: 4mm or greater (based on MendelMax running Repetier firmware and
- Nylon filament must be kept desiccated when not in use.
Calibration
Dimensional accuracy is very important for these hands as there are a lot of moving parts that need to fit together precisely and with minimal play. The following resources can guide you through the calibration process for most desktop 3D printers:
- Solidoodle calibration guide on Instructables
- RichRap’s RepRap calibration guide: Slic3r and extruder
- RichRap’s Slic3r calibration guide: filament and printing
e-NABLE Quality Specification
In order to maintain quality prints across many different types of printers, we ask for volunteer fabricators to target the following quality specification:
- No large gaps in between shells. The print must be “water-tight”.
- Layer height between 0.1mm and 0.25mm.
- No experimental, scented, or chemically-treated filament.
- Parts must be fabricated according to the above orientation guidelines.
- Printer must be properly calibrated to achieve the dimensional tolerances necessary for functioning hands.
What is the best printer to use?
Please visit our forums – they can best answer your questions there!
Here is the link!
http://forums.enablingthefuture.org/
Thank you!!
What are some of your other print settings you use with makerbot? Infill? Supports? With the length of this print I want to try and get it right the first time.
Please visit our forums – they can best answer your questions there!
Here is the link!
http://forums.enablingthefuture.org/
Out here in California there is a lot of machinery local support, but for software and design preparation it is still a little bit behind for the 3D printing experience. Thanks for sharing!
I agree that it is very important to make sure your 3D printers are calibrated carefully. It makes sense that the success of your projects depends on this and can help you save a ton of time and money on resources. Do you have any suggestions as to how often you should do this? I want to make sure I take proper care of my machines.