Implementation of a 3D printer based on the Scara kinematics
Video Youtube:
https://youtu.be/mBF5cO8vGhI
I am "Maker" – among others – within
LABSud, the FabLab in Montpellier, with a passionate interest in 3D printing.
I designed several 3D printer models notably the "I3 LABSud" derivative of the "I3 Prusa", which allowed us to equip the workshops of the Lab members.
I wanted to create a novel model, entirely based upon the experience I was able to gain inside the FabLab,
and after numerous creations I turned toward the Scara kinematics, aiming at building an Open-Source model duplicable with the means of the FabLab.
This open kinematics allows – among other features – a relatively easy re-dimensioning of a 3D printer !
After several tests to validate this kinematics, my choice went to the electronic driver "
Duet Wifi" developed by
David Crocker's, who provides full Open-Source boards and firmware.
When I decided to use
ReprapFirmware, the support of the Scara printers was not completely finalized, but within a month he fully completed the support of the various Scara kinematics in use.
Thus was born the Scarlette 3D printer, and you can watch
here its first presentation in video.
The Scara kinematics advantages are :
easy re-dimensioning of the printers;
capability to function without a tray, for example in case of a large printer fixed on a table or a wall;
relative simplicity of the mechanics;
aesthetic and open design.
And the disadvantages :
precision loss when the arm is stretched out;
Command algorithm more difficult to tune. But David Crocker's work almost entirely removed all these drawbacks !
A special thank to David Crocker's for his efficient reactiveness to improve the
RepRapFirmware in order for me to complete the Scarlette 3D development
My printer was recently chosen by the
YovoTogo,
JUMP Lab'Orione, and
Emmabuntüs associations to equip, in 2018, the future FabLab of Dapaong located in the savanna area of North Togo, and I hope to see it – later on – equip other FabLab in Africa
To make a greater use of the Scarlette 3D printer, the blueprints are available
here, and you can find hereafter the list of the components used for its design :
Duet WiFi board using the RepRapFirmware ;
Display 5" Paneldue ;
Temperature sensor PT100 ;
Daughter Board for the PT100 sensor ;
"IR Sense" sensor used for Z0 & Auto-Levelling ;
Hall effect limit switch sensor for both arms ;
Nozzle E3D-V6 bowden for 3mm filament (using a size of 1.75mm could be better with a Titan extruder) ;
Titan extruder from E3D ;
Power supply DC 12V 150W ;
Extruded aluminum structure Motedis I-Type rainure 5 ;
Arm motors : Stepperonline 0.9deg Nema 17 bipolar motor 2A 4.6kg/cm 17HM19-2004S ;
Z motor : Nema 17 1.68A Planet ratio 19:1 17HS19-1684S-PG19 ;
Silicone bed Kenovo 30X30CM 750W@220V ;
Pulley GT2 16 teeth for both arms ;
Pulley GT2 20 teeth, 8mm axis, for the Z motor ;
Two 608ZZ bearings for the Z drive ;
Frame plug 220 Volts with fuse and switch with indicator light.
Remark : The red parts of the Bed are made of 8mm thick red
Valcromat, trimmed with the FabLab laser cutting (co2 130 watts).
Links:
http://openhardware.eu/wordpress/scarlette3d/
https://sourceforge.net/projects/openhardware-eu/files/Scarlette3D/
https://youtu.be/mBF5cO8vGhI
https://www.duet3d.com/forum/thread.php?id=1847
https://www.duet3d.com/DuetWifi
My English is bad
it is a friend who translated this text from the French ...
Edited 4 time(s). Last edit at 09/29/2017 06:47PM by frafa.