DFM and cost estimates at design time, not after the quote

CADABRA Team · May 12, 2026 · 4 min read

The cheapest way to fix a $400 part is to not design it that way. The most expensive way is to find out from the quote. CADABRA’s Ask Mode pulls cost information and DFM guidance into the design phase, so the conversation happens before the file leaves your machine, not after.

What “DFM at design time” actually looks like

You are modeling a bracket. Before saving the part, you ask for a rough cost estimate in 6061 aluminum, 3-axis CNC, quantity 50.

What comes back is material cost, drawn from the stock tables and the part’s own mass properties and bounding box, and machining cost, from a roughing estimate plus setup amortized across the lot at a stated rate. The total is in USD, with the assumptions it used and where each rate came from. Where a driver cannot be read off the model, the total is withheld rather than guessed, and the reply names which one.

A DFM review runs on the same geometry and reports the faces that fail draft, minimum radius, wall thickness and undercut thresholds you set: the deep narrow pocket that forces a small end-mill and slow feeds, the corner radius too tight for the tool it implies, the wall too thin to hold. It returns findings, not a score.

Both are on Professional and Enterprise, and both are read-only. Neither replaces a quote from your shop, but together they tell you what your shop is going to flag before they see the file.

The kinds of questions worth asking

Cost ballpark

  • “What’s a rough cost estimate for this part in stainless 304, 3-axis CNC, qty 10?”
  • “How does the cost change if I make this from aluminum instead of steel?”
  • “Is sheet-metal cheaper than machining for this geometry at qty 100?”
  • “How much material does this part actually consume, including the stock waste?”

DFM checks

  • “What are the most expensive features on this part to machine?”
  • “Are any of these holes too deep relative to their diameter?”
  • “Are there any sharp internal corners that will force a small end-mill?”
  • “Is the wall thickness consistent enough for injection molding?”
  • “Are the tolerances I’ve called out reasonable for this process, or are they pushing the shop?”

Process selection

  • “At qty 5, qty 50, and qty 500, which manufacturing process is cheapest for this part?”
  • “What’s the crossover point where injection molding beats machining for this part?”
  • “Could this be made on a 3-axis machine, or does it need 5-axis?”

Where the numbers come from

Ask Mode is transparent about its inputs. When it returns a cost figure, it tells you:

  • The material rate it used and where it came from (cited URL).
  • The machining rate assumption (typically a regional average, named).
  • The process and setup assumptions (3-axis vs. 5-axis, single setup vs. multiple).
  • The quantity assumption.

If any of those assumptions are wrong for your situation, you can correct them in the next prompt, “redo the estimate with $X/hr machining rate”, and Ask Mode re-runs the calculation.

What this is not

It is not a quote

It is an estimate built from public rate data and DFM heuristics. Your actual shop will have different rates, fixtures, and capacity, and they are the only people who can give you a real number. The point of the estimate is to not be surprised when the quote comes back, and to catch the obvious cost drivers before that happens.

It is not a substitute for DFM review

For high-volume parts, you still want a real DFM review with your manufacturer. Ask Mode is the first pass, not the last.

It is not opinion-free

“Is this design good?” is a hard question, and Ask Mode will tell you what the model can defensibly answer and where it is making heuristic guesses. Use the citations.

The compounding effect

One DFM iteration before the file goes out for quote saves a quote cycle. One quote cycle is typically a week. Multiply that across the dozen parts in an assembly and the schedule impact is real, not because the AI is replacing the engineer, but because the engineer now has a fast feedback loop on the cost consequences of design choices.

For the rest of what Ask Mode does, see Ask Mode: a SOLIDWORKS expert that knows your model. To see it run on one of your parts, book a demo.

Common questions.

Does CADABRA give manufacturing feedback?
Yes, on Professional and Enterprise. DFM review reads the solid bodies and reports the faces that fail draft, minimum radius, wall thickness and undercut thresholds, which you can set per run. It returns findings, not a score. Cost estimate prices material and machining for a milled or turned part from its mass properties and bounding box, and states its assumptions; where a driver cannot be read it withholds the total rather than guessing. Both are read-only, and neither is on Free, Student or Standard.
What is Ask Mode?
Ask Mode is CADABRA’s read-only assistant. It answers questions about the open model, its geometry, dimensions, features, and materials, and it can search the web for component pricing, material properties, and manufacturing processes without leaving SOLIDWORKS. It makes no changes to your model.
How much time does it actually save?
It depends entirely on the work. The gains concentrate where the task is repetitive and well specified: generating drawings across an assembly, applying the same edit to a family of parts, and batch hole or fillet changes. On one-off modeling that needs judgment, expect little. The free plan exists so you can measure it on your own parts before paying.