I am a big fan of the mobile app for tracking and quick quotes. But why does the $104 welcome coupons only come with the desktop app download? Are there any plans to run a similar promo for mobile?

When designing parts for CNC machining, most issues don’t come from complex geometry — they come from small details that are easy to miss during design.

Here are some common CNC design details that often get overlooked, especially in early iterations:

1. Internal Corner Radii

Perfectly sharp internal corners look fine in CAD, but they’re not practical for CNC machining.
If the radius is too small, it can increase machining time, tool wear, or even cause redesigns.

Tip: Design internal corners with a radius that matches standard tool sizes whenever possible.

2. Overly Tight Tolerances

It’s tempting to apply tight tolerances “just to be safe,” but unnecessary precision increases cost and lead time.

Tip: Only tighten tolerances where function truly requires it.

3. Thin Walls

Thin walls may deform during machining, especially in metals or plastics with lower stiffness.

Tip: Check minimum wall thickness recommendations based on material and part size.

4. Deep Narrow Pockets

Deep pockets with small widths are difficult to machine efficiently and may require special tooling.

Tip: Reduce pocket depth, increase width, or split the part if possible.

5. Thread Depth and Hole Design

Blind holes that are too deep or threads that go all the way to the bottom are common issues.

Tip: Leave clearance at the bottom of blind holes and avoid unnecessary thread depth.

6. Surface Finish Expectations

Surface finish isn’t just cosmetic — it affects cost and processing steps.

Tip: Specify surface finish only where it matters functionally or visually.

7. Part Orientation Assumptions

Designs sometimes assume a specific machining orientation that isn’t obvious from the model.

Tip: If orientation matters, communicate it clearly or consider adding notes.

8. Sharp External Edges

Sharp edges may be unsafe and usually require extra deburring work.

Tip: Add chamfers or fillets to external edges by default.

9. Material Behavior Differences

Different materials behave very differently under the same geometry.

Tip: Re-evaluate design details when switching materials, even if geometry stays the same.

10. Forgetting Assembly Context

A part that looks fine alone may not assemble easily with parts.

Tip: Always review how the part fits into the full assembly.

CNC-friendly design isn’t about making parts simpler — it’s about making them smarter to manufacture.

What design detail caused you the most trouble in a past CNC project?
Or which one do you still find easy to overlook?

Feel free to share your experience or ask questions below.

Hey JLCHUB! Quick question for all JLCONE users:

Which app do you find yourself using more – the Desktop or Mobile version?

• Do you use one for placing orders and the other just for tracking?
• Or do you almost always stick to just one platform?

Tell us your preference and why in a quick reply!

Whether you’re new to CNC machining or already have some hands-on experience, the design-to-production process usually comes with a few sticking points.

We’re curious to hear from the community:

Which part of your CNC design process do you find most challenging?

Some common areas people mention include:

• Designing parts that are easy to machine, not just functional in CAD
• Choosing the right material (strength, cost, machinability)
• Managing tolerances without over-specifying
• Understanding which features drive cost or lead time
• Preparing files correctly for quoting and manufacturing
• Iterating designs quickly without blowing the budget

There’s no “right” answer here — beginners and experienced engineers often struggle with different things.

Feel free to share:

• A specific problem you’ve run into
• A lesson learned from a past CNC project
• A question you wish you’d asked earlier
• Or tips that helped you improve your workflow

If you’re currently working on a CNC part, you can also describe your project at a high level and get feedback from others in the community.

Let’s learn from each other’s real-world experience.

For many first-time CNC users, the design-to-manufacturing step can raise a lot of practical questions.
Below are some common topics that often come up when preparing CNC parts for production.
This post is meant to help you spot potential issues early and make the process smoother.

1. What file formats are typically accepted for CNC machining?
   Most CNC workflows start from standard 3D CAD files.
   Before uploading, it’s generally a good idea to:

• Ensure the model is a solid body, not just surfaces
• Remove unnecessary features or construction geometry
• Double-check units (mm vs inch)
  Clean, well-prepared files help reduce misunderstandings later in the process.

1. How precise does my design need to be?
   First-time users often ask about tolerances.
   A good rule of thumb is:

• Only specify tight tolerances where they are functionally necessary
• Avoid over-constraining every dimension unless required
  Clear intent in the design usually matters more than extreme precision everywhere.

1. Are sharp internal corners a problem?
   Yes—this comes up frequently.
   Because CNC tools are round, sharp internal corners cannot be perfectly machined.
   Designers often:

• Add fillets to internal corners
• Adjust parts to allow for tool radius
  These small adjustments can significantly improve manufacturability.

1. How do I choose the right material?
   Material choice affects:

• Machinability
• Surface finish
• Strength and weight
  For early prototypes, many users prioritize ease of machining and cost, then refine material choices in later iterations.

1. Why does the system flag warnings during quoting?
   System warnings are usually meant to highlight:

• Very thin walls
• Deep narrow pockets
• Features that may be difficult to machine
  They don’t always mean something is “wrong,” but they’re worth reviewing before proceeding.

1. Should I start with a prototype before ordering more parts?
   Many users find it helpful to:

• Order a small quantity first
• Validate fit, assembly, and function
• Adjust the design before scaling up
  Iteration is a normal part of CNC-based product development.

Join the discussion
If you’re new to CNC machining:

• What questions did you have before placing your first order?
• What caught you by surprise during your first build?
  Feel free to share your experience or ask general, design-related questions here.
  For order-specific issues, quoting details, or account support, please contact JLCCNC through the official support channels.

We’re always looking for ways to improve JLCCNC, and feedback from real users is one of the most valuable inputs we have.

You’re welcome to share suggestions on topics such as:

• Website or quoting experience
• File upload or design review process
• Communication and information clarity
• Features you’d like to see in the future

💬 How to post feedback effectively:

• Describe your use case or scenario
• Focus on what could be improved and why
• Keep feedback constructive and specific

This forum thread is for ideas and suggestions. For order-related issues or support requests, please contact JLCCNC through official support channels so they can be handled properly.

Thank you for helping us build a better service.

A Top Side Stencil follows the top side data of your Gerber file.

It’s the most common option if you’re only placing components on the top side of your PCB.

💬Do you usually assemble only top-side components, or do you often need bottom-side stencils too?

Ever struggled with PCBs that have components of different heights in the same paste layer?

That’s where Step Stencils come in handy.

Why use a Step Stencil?

Different aperture heights for components of varying thickness

Ensures even paste deposition across all parts

Reduces bridging or insufficient solder for taller components

Compatible with fine-pitch and dense layouts

At JLCPCB, Step Stencils are laser-cut with precision, and you can choose framed option, with electropolishing or nano-coating for improved paste release.

💬 We’re curious:

Have you tried a Step Stencil for your boards yet?

Which types of components or layouts do you usually use it for?

Share your experience — your tips might help someone else handle tricky PCBs!

At JLCPCB, we offer two types of SMT stencils:

1️⃣ Framed Stencils

Comes with a sturdy frame for easier handling

Ideal for repeated printing or using with pick-and-place machines

Keeps tension even and flat, especially for larger PCBs

2️⃣ Frameless Stencils

Just the stencil sheet, no frame included

Perfect for smaller boards or prototyping

Can be used with manual stencil holders or clamps

Both options give laser-cut precision and clean apertures, with optional electropolishing or nano coating for better paste release.

💬 We’d love to hear from you:

Which type do you usually use — framed or frameless?

Any tips or tricks for handling them during assembly?

Nano-coated SMT stencils are designed to improve solder paste release, especially for fine-pitch and dense PCB designs.

By applying a nano-scale coating to the stencil surface and aperture walls, the stencil becomes more hydrophobic, which helps reduce solder paste adhesion and residue during printing.

🔍 What problems can nano-coated stencils help solve?

Poor paste release on fine-pitch components

Inconsistent deposits on small apertures

Paste sticking to the bottom of the stencil

Frequent stencil cleaning during assembly

⚙️ Typical use cases

Nano-coated stencils are commonly used for:

Fine-pitch ICs (QFN, LQFP, small-pitch connectors)

High-density PCBs

Boards with mixed aperture sizes

Projects requiring more stable printing consistency

🧠 Things to keep in mind

Nano coating does not replace proper aperture design

Paste type and printing parameters still matter

It’s especially effective when combined with electropolished apertures

💬 Share your experience

Have you used a nano-coated stencil before?

What pitch or component type did you use it for?

Did it reduce cleaning frequency or improve consistency?

Hand assembly or machine printing?

Feel free to start a new post to share your results, photos or questions.

Your real-world experience can help others choose the right stencil for their projects.

This space is created for makers, engineers, and PCB assembly enthusiasts to share, discuss, and learn about everything related to SMT stencils.

Here, you’re encouraged to:

1.Share your SMT stencil experiences (hand soldering or machine assembly)

2.Discuss stencil types (framed, frameless, electropolished, nano-coated, etc.)

3.Post assembly tips, paste release results, or real project photos

4.Ask questions about aperture design, pitch challenges or yield improvement

Whether you’re working on a simple prototype or a complex fine-pitch design, your insights and questions can help others in the community.

💬 Everyone is welcome to post, comment, and exchange ideas.

Let’s build a practical and friendly knowledge hub for SMT stencil users together.

Happy sharing,

SMT Stencil Team

When it comes to PCB assembly, stencil quality directly affects solder paste deposition and yield.

At JLCPCB, our SMT stencils start from just $3, making professional-grade stencil manufacturing accessible for prototyping and small-batch production.

What you get:

Laser-cut apertures with high precision

Smooth aperture walls for stable paste release

Available options: framed / frameless, electropolishing, nano-coating

Compatible with fine-pitch and dense SMT designs

Whether you’re assembling boards by hand or using pick-and-place machines, a reliable stencil helps improve consistency and reduce rework.

SMT Stencil from $3 — design upload takes only minutes.

Feel free to share your stencil setup or assembly experience in the comments.

Whether you’re designing a prototype, refining a mechanical enclosure, or validating a new hardware idea, JLCHUB is a place to discuss not just designs — but how to make them real.

For members working on mechanical parts, enclosures, fixtures, or functional prototypes, JLCCNC is part of the JLC ecosystem that supports:

• CNC machining for metal and plastic parts
• Low-volume prototyping and iteration
• Design-to-manufacturing discussions (tolerances, materials, finishes)

Here in the community, you’re welcome to:

• Share CNC-related design questions or challenges
• Discuss manufacturability and optimization tips
• Post project showcases and lessons learned
• Ask for peer feedback before sending parts to production

🔧 Important note:
JLCHUB is a technical discussion space. For order-specific questions (quotes, accounts, or support), please contact JLCCNC via the official website support channels.

If you’re combining electronics + mechanics, or moving from CAD to real parts, you’re in the right place.

Welcome, and feel free to start a discussion.

Hi everyone!

We've been expanding our services to support more of your project stages—from PCB and PCBA to 3D printing, CNC machining, and mechanical parts sourcing. Now with JLCONE, all these services are integrated into one app for easier access.

We're curious: How many JLC services have you tried so far?

Take a quick look at the list below and tell us in the replies which ones you've already used in your projects:

• PCB Fabrication (JLCPCB)
• PCB Assembly (JLCPCB)
• SMT Stencil (JLCPCB)
• PCB Layout Service (JLCPCB)
• Flexible Heater (JLCPCB)
• 3D Printing (JLC3DP)
• CNC Machining (JLCCNC)
• Sheet Metal (JLCCNC)
• Mechanical Parts Sourcing (JLCMC)

Also, we'd love to hear your thoughts on what other types of services could help you in future projects. Is there a specific manufacturing or design service you wish JLC offered?

Let's share and compare notes—looking forward to reading your experiences!

Calling all JLCONE early users!

As we continue to refine JLCONE, your experience and feedback are invaluable to us. If you encounter any bugs, glitches, or unexpected behavior while using the app—whether on desktop or mobile—we want to know!

Please share these important details:

• The platform you're using (Windows/macOS/Android/iOS)
• Steps to reproduce the issue
• Screenshots if possible

Our development team will work to resolve reported issues promptly. Your input helps us create a more reliable, user-friendly app for the entire community.

Thank you for being part of JLCONE's growth. Together, let's build the best manufacturing companion out there!

Q&A User Guide｜Standardized Questions, Precision Answers!

At JLCHub, we provide engineers with a specialized Q&A system designed to deliver faster, more targeted technical solutions. Whether you're struggling with:

• Design Challenges - Circuit/mechanical design bottlenecks
• Software Bugs - Firmware/algorithm/implementation issues
• Component Selection - Part compatibility/cost-performance dilemmas
• Process Obstacles - Production/workflow optimization

Our structured Q&A format ensures you receive actionable solutions from industry experts.

1. What is the Q&A?

Q&A is a problem-driven posting format focused on resolving specific technical issues (unlike general discussions).

Core Features:

🎯 Structured Format: Clear titles with detailed problem descriptions

💰 Bounty System: Offer points to incentivize quality responses

✅ Solution Validation: Mark accepted answers as "Best Solution"

🔍 Smart Sorting: Answers ranked by time and community votes

2. Why use Q&A?

Improves Problem Resolution Rate:

Standardized question formats make problems logical and easier to understand. Centralized Q&A sections help focus community attention.

Boosts Motivation to Answer:

Community members earn points by providing solutions, encouraging active participation.

Helps Fellow Engineers Learn and Grow:

Archived Q&A exchanges become valuable resources for others facing similar issues.

3. How to Create a High-Quality Q&A Post?

A well-structured question significantly increases your chances of receiving high-quality answers. Include the following details:

3.1 Precise Title:

• Clearly summarize your issue in one sentence (e.g., "How to resolve GPU memory overflow in TensorFlow 2.8?" instead of "Help with a technical problem").

3.2 Detailed Context:

• Describe the environment (software/hardware versions, OS, etc.).
• Explain the steps leading to the issue (with code/commands if applicable).
• Attach screenshots or error logs when possible.

3.3 Expected vs. Actual Behavior:

• State what result you anticipated.
• Specify what actually occurred (with error messages, if any).

3.4 Attempted Solutions:

• List troubleshooting steps you've already tried (avoid "I've tried everything" statements)

3.5 Additional Resources:

• Include relevant documentation links or reference materials.
• For UI-related issues, attach annotated screenshots highlighting problem areas.

4. About Point Rewards

• All users can accumulate points by participating in discussions, answering questions, daily check-ins, and other activities.
• When creating a Q&A post, you may offer a point reward (the system suggests recommended amounts).
• Users whose answers are marked as “Best Answer” will receive the allocated reward points.

5. How to Access the Q&A Function

You can post Q&A questions through the following methods:

• Click the [Ask Question] button on any category page.
• Select “Post as a Q&A Question” and fill in complete details.
• Set a point reward (adjust based on question complexity).

Try the Q&A function now - don't let your questions go unanswered!

For more details about the point reward system, please read: JLCHub Points Policy Guide

JLCHub Category System Overview & Posting Guide

To improve the efficiency of technical discussions and the accuracy of content search, JLCHub organizes all posts by category. This guide explains the principles behind the category system and gives suggestions on how to use it effectively.

1. Category Structure: JLC-Specific vs. General Engineering

JLCHub categories are divided into two main groups:

1.1 JLC Global (JLC-specific content)

Covers topics directly related to JLC services, including:

• Platform Services and Updates (announcements, events, new feature releases)
• Order & Technical Support (e.g., SMT assembly, prototyping rules, component sourcing process)
• Customer Communication & Feedback (e.g., bug reports, feature requests, shipping experiences sharing)

This section helps users quickly access official information and engage with JLC more efficiently.

1.2 Engineering & Technical (General technical content)

Focus on technical issues in engineers' daily design, debugging, and learning, including:

• Hardware: electronics, mechanical hardware, and related subjects
• Software: embedded system development and hardware-related software (with future plans to include pure IT topics)
• Engineering Theory (planned): fundamental engineering theories and principles

Such content is categorized by specialized technical fields, aiming to help engineers from different disciplines quickly locate relevant topics and engage with corresponding professional circles.

2. Dynamic Adjustment of Subcategories

To continuously optimize our categorization system, we regularly evaluate the following two dimensions:

• Domain Accuracy: Does the category clearly represent a specific knowledge area? (e.g., “Control Engineering” is clearer than “Automation”).
• Content Volume: Is there enough activity and user interest to justify a standalone category?

Adjustment Principles:

• If posts on a certain topic grow rapidly, moderators may create a dedicated category.
• Niche or overlapping categories may be merged or hidden.
• Category names will aim to remain professional, standardized, and unambiguous.

Suggesting New or Updated Categories

Any user can post suggestions in the JLCHub section (recommended format: Proposed category name + Reason for suggestion + Example topics).

3. Always Choose the Most Relevant Category When Posting

Picking the right category makes your post easier to find and more likely to get quality replies.

👉 Correct category = faster responses + better visibility in recommendations.

4. Official Team Assists with Category Optimization

The JLC official team and volunteer moderators will regularly review posts and help maintain the system by:

• Moving posts that are clearly miscategorized
• Reassigning posts that were left uncategorized or in the default category
• Contacting authors with suggestions for better category choices

We encourage all users to take a few extra seconds to choose the right category when posting. This reduces unnecessary moderation and ensures your content reaches the right audience immediately.