I’ve been finishing my new 3-D printer.
Here is a link to a video of one of it’s first prints: Raptosaur.
I was printing a leopard seal skull from digimorph.org at 30% scale, at the Mini Makerfaire at Vocademy in Riverside CA. When it’s calibrated I will be able to print this full scale. I want to provide full size fossil and animal skulls to local schools.
The features of this printer:
- Large printing area: 14″ diameter (or as wide as 17″) by 24″ tall
- Temperature controlled build chamber to allow building big without shrinkage problems
- Double pane Lexan window
- Magnetic ball joints for low friction no-lash movement
- Carbon fiber rods
- High temperature neodymium magnets in the carbon fiber rods attach them to the ball joints
- Heated build plate made from cast aluminum tooling plate
- High resolution (400 step), high torque Nema 23 stepper motors
- Custom direct-drive Bowden Extruder (using the same model stepper)
- Custom Hot-End using coaxial cooling (details in another post)
- The case is built using 3/4″ MDO plywood
- A Rumba controller (for now)
In the video I had just gotten the printer working, with a few bugs to iron out. Since then I have:
- Adjusted the accelerations to fix problems with missing steps.
- Ground flats on the stepper motor shafts to keep the pulleys from slipping
- Printed stronger parts for the extruder tension leaver
- Printed a new effector assembly and bearing brackets for stronger support of the ball bearings
- Upgraded to the latest Repetier firmware.
- Switched from Cura to Slic3r.
- Built new 1/2″ solid steel stepper motor mounts – these are much quieter! We built these at Vocademy.
Still to do:
- Build a mini Hall effect sensor for bed probing (doing this now)
- Build the power supply board for the heated bed (also in progress)
- Finish other calibrations – retraction, extrusion amount
- Assemble the new effector assembly with better attachment for the 1/2″ bearings (and will use a better adhesive)
- Fan speed controllers
- Control panel
- Upper surround
So much to do… I will update this in a bit.