Added advanced example from @adam-urbanczyk as Ex032.
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Jeremy Mack Wright
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CadQuery/Examples/Ex032_3D_Printer_Extruder_Support.py
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216
CadQuery/Examples/Ex032_3D_Printer_Extruder_Support.py
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# 3d printer for mounting hotend to X-carriage inspired by the P3steel Toolson
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# edition - http://www.thingiverse.com/thing:1054909
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import cadquery as cq
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from Helpers import show
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def move_to_center(cqObject, shape):
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'''
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Moves the origin of the current Workplane to the center of a given
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geometry object
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'''
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# transform to workplane local coordinates
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shape_center = shape.Center().sub(cqObject.plane.origin)
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# project onto plane using dot product
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x_offset = shape_center.dot(cqObject.plane.xDir)
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y_offset = shape_center.dot(cqObject.plane.yDir)
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return cqObject.center(x_offset, y_offset)
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# Parameter definitions
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main_plate_size_y = 67 # size of the main plate in y direction
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main_plate_size_x = 50. # size of the main plate in x direction
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main_plate_thickness = 10. # thickness of the main plate
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wing_size_x = 10. # size of the side wing supporting the bridge in x direction
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wing_size_y = 10. # size of the side wing supporting the bridge in y direction
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bridge_depth = 35. # depth of the bridge
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support_depth = 18. # depth of the bridge support
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cutout_depth = 15. # depth of the hotend cutout
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cutout_rad = 8. # radius of the cutout (cf groove mount sizes of E3D hotends)
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cutout_offset = 2. # delta radius of the second cutout (cf groove mount sizes of E3D hotends)
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extruder_hole_spacing = 50. # spacing of the extruder mounting holes (Wade's geared extruder)
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m4_predrill = 3.7 # hole diameter for m4 tapping
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m3_predrill = 2.5 # hole diameter for m3 tapping
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m3_cbore = 5. # counterbore size for m3 socket screw
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mounting_hole_spacing = 28. # spacing of the mounting holes for attaching to x-carriage
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aux_hole_depth = 6. # depth of the auxiliary holes at the sides of the object
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aux_hole_spacing = 5. # spacing of the auxiliary holes within a group
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aux_hole_N = 2 # number of the auxiliary hole per group
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# make the main plate
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res = cq.Workplane('front').box(main_plate_size_x,
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main_plate_size_y,
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main_plate_thickness)
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def add_wing(obj, sign=1):
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'''
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Adds a wing to the main plate, defined to keep the code DRY
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'''
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obj = obj.workplane()\
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.hLine(sign*wing_size_x)\
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.vLine(-wing_size_y)\
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.line(-sign*wing_size_x, -2*wing_size_y)\
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.close().extrude(main_plate_thickness)
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return obj
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# add wings
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# add right wing
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res = res.faces('<Z').vertices('>XY')
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res = add_wing(res)
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# store sides of the plate for further reuse, their area is used later on to calculate "optimum" spacing of the aux hole groups
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face_right = res.faces('>X[1]').val()
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face_left = res.faces('>X[-2]').val()
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# add left wing
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res = res.faces('<Z').vertices('>Y').vertices('<X')
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res = add_wing(res, -1)
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# make the bridge for extruder mounting
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wp = res.faces('>Z') # select top face
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e = wp.edges('>Y') # select most extreme edge in Y direction
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bridge_length = e.val().Length() # the width of the bridge equals to the length of the selected edge
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# draw the bridge x-section and extrude
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res = e.vertices('<X'). \
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workplane(). \
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hLine(bridge_length). \
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vLine(-10). \
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hLine(-bridge_length). \
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close().extrude(bridge_depth)
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faces = res.faces('>Z[1]') # take all faces in Z direction and select the middle one; note the new selector syntax
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edge = faces.edges('>Y') # select the top edge of this face...
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res = move_to_center(faces.workplane(), edge.val()).\
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transformed(rotate=(0, 90, 0)) # ...and make a workplane that is centered in this edge and oriented along X direction
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res = res.vLine(-support_depth).\
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line(-support_depth, support_depth).\
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close() # draw a triangle
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res = res.extrude(main_plate_size_x/2, both=True, clean=True) # extrude the triangle, now the bridge has a nice support making it much more stiff
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# Start cutting out a slot for hotend mounting
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face = res.faces('>Y') # select the most extreme face in Y direction, i.e. top ot the "bridge"
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res = move_to_center(face.workplane(), face.edges('>Z').val()) # shift the workplane to the center of the most extreme edge of the bridge
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def make_slot(obj, depth=None):
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'''
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Utility function that makes a slot for hotend mounting
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'''
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obj = obj.moveTo(cutout_rad, -cutout_depth).\
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threePointArc((0, -cutout_depth-cutout_rad),
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(-cutout_rad, -cutout_depth)).\
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vLineTo(0).hLineTo(cutout_rad).close()
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if depth is None:
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obj = obj.cutThruAll()
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else:
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obj = obj.cutBlind(depth)
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return obj
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res = make_slot(res, None) # make the smaller slot
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cutout_rad += cutout_offset # increase the cutout radius...
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res = make_slot(res.end().end(), -main_plate_thickness/2) # ...and make a slightly larger slot
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res = res.end().moveTo(0, 0) \
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.pushPoints([(-extruder_hole_spacing/2, -cutout_depth), (extruder_hole_spacing/2, -cutout_depth)]) \
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.hole(m4_predrill) # add extruder mounting holes at the top of the bridge
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# make additional slot in the bridge support which allows the hotend's radiator to fit
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cutout_rad += 3*cutout_offset
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res = make_slot(res.end().moveTo(0, 0).workplane(offset=-main_plate_thickness))
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# add reinforcement holes
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cutout_rad -= 2*cutout_offset
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res = res.faces('>Z').workplane().\
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pushPoints([(-cutout_rad, -main_plate_thickness/4),
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(cutout_rad, -main_plate_thickness/4)]).\
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hole(m3_predrill)
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# add aux holes on the front face
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res = res.moveTo(-main_plate_size_x/2., 0).workplane().rarray(aux_hole_spacing, 1, aux_hole_N, 1) \
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.hole(m3_predrill, depth=aux_hole_depth)
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res = res.moveTo(main_plate_size_x, 0).workplane().rarray(aux_hole_spacing, 1, aux_hole_N, 1) \
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.hole(m3_predrill, depth=aux_hole_depth)
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# make a hexagonal cutout
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res = res.faces('>Z[1]')
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res = res.workplane(offset=bridge_depth). \
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transformed(rotate=(0, 0, 90)). \
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polygon(6, 30).cutThruAll()
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# make 4 mounting holes with cbores
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res = res.end().moveTo(0, 0). \
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rect(mounting_hole_spacing,
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mounting_hole_spacing, forConstruction=True)
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res = res.vertices(). \
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cboreHole(m3_predrill,
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m3_cbore,
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bridge_depth+m3_cbore/2)
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# make cutout and holes for mounting of the fan
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res = res.transformed(rotate=(0, 0, 45)). \
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rect(35, 35).cutBlind(-bridge_depth).end(). \
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rect(25, 25, forConstruction=True).vertices().hole(m3_predrill)
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def make_aux_holes(workplane, holes_span, N_hole_groups=3):
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'''
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Utility function for creation of auxiliary mouting holes at the sides of the object
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'''
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res = workplane.moveTo(-holes_span/2).workplane().rarray(aux_hole_spacing, 1, aux_hole_N, 1) \
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.hole(m3_predrill, depth=aux_hole_depth)
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for i in range(N_hole_groups-1):
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res = res.moveTo(holes_span/(N_hole_groups-1.)).workplane().rarray(aux_hole_spacing, 1, aux_hole_N, 1) \
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.hole(m3_predrill, depth=aux_hole_depth)
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return res
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# make aux holes at the bottom
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res = res.faces('<Y').workplane()
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res = make_aux_holes(res, main_plate_size_x*2/3., 3)
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# make aux holes at the side (@overhang)
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res = res.faces('<X').workplane().transformed((90, 0, 0))
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res = make_aux_holes(res, main_plate_size_x*2/3., 3)
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res = res.faces('>X').workplane().transformed((90, 0, 0))
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res = make_aux_holes(res, main_plate_size_x*2/3., 3)
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# make aux holes at the side (@main plate)
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res = res.faces('|X').edges('<Y').edges('>X')
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res = res.workplane()
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res = move_to_center(res, face_right)
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res = res.transformed((90, 0, 0))
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hole_sep = 0.5*face_right.Area()/main_plate_thickness
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res = make_aux_holes(res, hole_sep, 2)
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# make aux holes at the side (@main plate)
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res = res.faces('|X').edges('<Y').edges('<X')
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res = res.workplane()
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res = move_to_center(res, face_left)
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res = res.transformed((0, 180, 0))
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hole_sep = 0.5*face_right.Area()/main_plate_thickness
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res = make_aux_holes(res, hole_sep, 2)
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# show the result
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show(res)
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