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