jdegenstein

System Prompt: build123d CAD Expert

You are an expert CAD modeling assistant specializing in build123d. Your goal is to generate high-quality, idiomatic Python code to create models using the Builder API.

Core Modeling Principles

1. Context-Based Modeling: Always use the with statement for builders: BuildLine (1D), BuildSketch (2D), and BuildPart (3D).
2. Support Visualization: Always assign builders to a variable. NEVER use an anonymous context manager for builders (e.g., with BuildLine(): is strictly forbidden). It must always be e.g., with BuildLine() as l: and use conventional names like l, l2 ... ln, p, pn, and s, sn.
3. Implicit State & Empty Shapes: Objects created within a builder context are automatically added to that builder's geometry unless mode=Mode.PRIVATE is specified. Crucially, build123d has an explicit concept of an "empty" or "zero" Shape. Ensure the active context is not empty before applying subtractive or intersecting operations. (e.g., If

jdegenstein

def non_linear_parameters_95_percent_confidence_interval(fvec, jac):
    """Returns the 95% confidence interval on parameters from
    non-linear fit results."""
    # residual sum of squares
    rss = np.sum(fvec**2)
    # number of data points and parameters
    n, p = jac.shape
    # the statistical degrees of freedom
    nmp = n - p
    # mean residual error

jdegenstein

to format multi-line python code in discord, type: \```py```py
def codegoeshere():
    print("foobar")
```\```

jdegenstein

{
	// build123d CodeCAD speedmodeling snippet by Jern
	//
	// This was specifically designed for use with TooTallToby's modeling challenges, but applicable for
	// all CodeCAD modeling, but customize as desired for your own needs. This provides:
	// 1. A file template that reduces the time necessary to "just start coding/modeling"
	// 2. Shortcuts like "?ebds + TAB" that creates a BuildSketch + extrude block
	//
	// recommended to bind "Snippets: Fill file with Snippet" to e.g. CTRL + ALT + N
	// recommended to bind "Jupyter: Restart Kernel" to e.g. CTRL + ALT + /

jdegenstein

import cadquery as cq
from random import randrange as rrr
from random import seed

#Soma set consists of 7 separate pieces
# 4 pieces can be x-y plane only, other 3 require x-y-z

#keep the same pseudo random colors later:
seed(5)#keep colors run-to-run
#(3,4,5,77,777,51221,512796321 are good seeds)

jdegenstein

import cadquery as cq
from random import randrange as rrr
from random import seed
seed(10) #set seed for consistent colors
from OCP.BRepPrimAPI import (
    BRepPrimAPI_MakePrism,
)

from OCP.BRepAlgoAPI import (
    BRepAlgoAPI_Common,

jdegenstein

#CadQuery OCC Hash Testing with Output of New Faces
#cq_occ_hash_woutput.py
import cadquery as cq
from random import randrange as rrr
from random import seed
seed(10) #set seed for consistent colors
from OCP.BRepPrimAPI import (
    BRepPrimAPI_MakePrism,
)

jdegenstein

import cadquery as cq
from OCP.BRepPrimAPI import (
    BRepPrimAPI_MakePrism,
)

from OCP.BRepAlgoAPI import (
    BRepAlgoAPI_Common,
    BRepAlgoAPI_Fuse,
    BRepAlgoAPI_Cut,
    BRepAlgoAPI_BooleanOperation,

jdegenstein

import cadquery as cq
from cadquery import Location, Vector
from math import degrees, sin, cos, radians, pi

od = 100
dotr = 2
rim = 4
dot_offs = 10
ov_th = 5
dot_ang = 360/12