K8200 / 3drag GT2 belt extruder
by crashmatt, published
A simple way to change to belt extrusion for less noise and reduced wear. Includes a printable 80 tooth GT2 pulley.
openSCAD parametric cad file included. Can be used to change number of teeth.
Based on this very nice pulleys library:
UPDATE: There was a version posted with no holes and a thin back wall. It didn't work well since it flexed too much. It has now been removed. Thanks to turbotommi for testing.
UPDATE 14/01: RobotDigg changed the GT2 belt pack. See instructions for details
Printer: K8200 very modified
Resolution: 0.3mm layers
Notes:PLA or ABS. Nylon is too flexible. Invert to print without support Print outer perimeters slowly for best tooth resolution (~40mm/s). Infill as fast as you like.
The 80 tooth pulley included puts the motor at maximum adjustment. You may wish to print an 82tooth version or use a 20tooth pulley on the motor side. My preference is for more torque to prevent the extruder stalling.
openSCAD compilation, STL generation and slicing is quite slow due to the high definition teeth and cutout details.
WARNING: The belt changes the direction of the extrude motor compared to gears. You will need to rebuild and reprogram for this to work. See this code line in configuration.h:
The line number changes as the codebase changes. You may need to search for E0_DIR to find it.
The K8200 code has it set true. It should be set to false as follows:
"#define INVERT E0_DIR false"
The ratio is 16:80 instead of 10:44 so you need to change steps/mm from 600 to 682. This is set in the eeprom settings through repetier. The default values are set in configuration.h here as defined value DEFAULT_AXIS_STEPS_PER_UNIT. Extrude step ratio is the last value in the set:
This value is overidden by the EEPROM contents. If you change the default you may not get any real change. Modify using repetier eeprom settings.
Using these parts from robotdigg allows the belt to be tight enough at the end of the motor adjustment range:
16tooth 5mm bore GT2 pulley
188mm GT2 belt : UPDATED 14/01
If this belt is not in stock, turbotommi found GT2 belt at aliexpress:
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K8200 / 3drag GT2 belt extruder by crashmatt is licensed under the Creative Commons - Attribution - Share Alike license.
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