Fan & extrudrboard holder for bq prusa i3 hephestos
thingiverse
If you've got an ExtrudrBoard (dual stepper driver board) it can drive an additional two steppers to expand your RAMPS. Here's how to modify one: How I Made This Part: First, download the original fan holder from bq's website. Then cut off the bottom so that it becomes smooth in Netfabb. Use part repair in Netfabb next. After importing the part into OpenSCAD, add four mounting brackets for the ExtrudrBoard. Now render and export it to STL. The included G-code is meant for a bq Witbox 3D printer. Known Good Slicer Settings: Use layer heights of 0.2 mm, 40% infill density, and set your Z-lift to 0.1 mm on retract.
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