If you’ve spent any time in SolidWorks sheet metal forums, you’ve seen the same conversation play out: someone asks how everyone handles tabs and slots, and the replies split into three camps — Design Library features, manual boss extrudes, and the built-in Tab and Slot feature. Each approach works, but they all share one frustrating problem when it comes time to export DXFs.
You forget a setting, and your fabricator gets bad files.
The Design Library checkbox problem
Design Library features are a popular way to add tabs and slots to sheet metal parts. You model a tab once, save it to the library, and then drag it onto any part. It’s consistent, it’s reusable, and it patterns easily.
The catch appears at export time. When you export a flat pattern to DXF, SolidWorks has a checkbox to include Design Library features in the output. If you don’t check it, the tabs and slots from your library features won’t appear in the flat pattern DXF. Your laser operator gets a flat blank with no tab cutouts, and the parts don’t fit together.
It’s not a difficult step. But it’s an easy one to miss — especially when you’re exporting 30 or 40 parts from an assembly and the export dialog resets to its defaults every time.
The Tab and Slot feature isn’t perfect either
SolidWorks introduced a dedicated Tab and Slot feature to streamline this workflow. In theory it’s great: pick an edge, pick a face, and SolidWorks creates mating tabs and slots automatically.
In practice, users report several recurring issues:
- Broken mates and relations — The feature can break relations and mates on the slotted surface, especially if you’ve mated to faces rather than planes.
- Inconsistent face selection — Sometimes it picks the correct face to slot, other times it grabs a face from a neighbouring part entirely.
- Fragile feature tree — Editing or reordering features around Tab and Slot can cause rebuild errors that are hard to diagnose.
These issues push many engineers back to manual methods or Design Library features — which circles back to the export settings problem.
Why export settings don’t stick in SolidWorks
The core issue is that SolidWorks does not reliably persist DXF export settings between sessions. Every time you open the Export to DXF dialog, you’re at risk of working with default settings rather than the ones you configured last time.
For most engineers this means mentally tracking a checklist before every export:
- Is the Design Library checkbox ticked?
- Are bend lines included or excluded?
- Are the correct layers mapped?
- Is the file naming convention right?
- Are units set correctly?
Miss any one of these and you’re re-exporting files, or worse, your fabricator cuts parts with incorrect geometry.
CadShift: persistent settings that stay where you put them
CadShift solves this with persistent export settings that survive across SolidWorks sessions. You configure your export preferences once, and they apply every time — no dialog boxes to re-check, no mental checklists.
How persistent settings work
When you set up CadShift’s export configuration, your preferences are saved to a settings profile that loads automatically when SolidWorks starts. This includes:
- Design Library feature handling — Always included in flat pattern exports, no checkbox to remember.
- Bend line preferences — Include, exclude, or trim to boundary — whatever you set stays set.
- Layer mapping — Geometry, bend lines, and forming tools go to the layers your fabricator expects, every time.
- File naming tokens — Your
{PartNumber}_{Thickness}_{Material}convention applies automatically without retyping. See our file management best practices guide for naming conventions that work well with automated exports. - Metadata embedding — Material, thickness, quantity, and custom properties are written into the DXF consistently.
The settings persist because CadShift manages them independently of SolidWorks’ own export dialog. You’re not relying on SolidWorks to remember — CadShift remembers for you.
One-click export with the right settings
Once your profile is configured, exporting an entire assembly is a single operation:
- Open your assembly.
- Click CadShift → Batch Export DXF.
- CadShift traverses the full assembly tree, identifies sheet metal parts, and exports flat patterns with your saved settings applied to every file.
Design Library features are included. Bend lines are configured correctly. File names follow your convention. Every time, without exception.
A better workflow for tabs and slots
Whichever method you use to create tabs and slots — Design Library features, manual boss extrudes, or the built-in Tab and Slot feature — the export step shouldn’t be where things go wrong. The geometry you modelled should be the geometry your fabricator receives.
Here’s a practical workflow that combines flexibility in modelling with reliability in export:
1. Model however suits your project
Use Design Library features when you want consistency and reusability across projects. Use manual boss extrudes when you need full control over a one-off geometry. Use Tab and Slot when it works cleanly for your specific assembly. The modelling method is a design choice — pick what fits.
2. Configure CadShift once
Set up your export profile with the correct Design Library settings, layer mappings, bend line preferences, and file naming convention. This takes a few minutes the first time and never needs repeating.
3. Export without second-guessing
Run the batch export and move on. Your settings are locked in. No forgotten checkboxes, no inconsistent file names, no calls from the shop floor asking why the tabs are missing.
Stop losing time to export settings
The Reddit thread that inspired this post captures a real frustration: engineers spend time finding the right modelling approach for tabs and slots, only to trip over the export step. The Design Library checkbox, the inconsistent Tab and Slot behaviour, the settings that don’t persist — these are workflow problems, not modelling problems.
CadShift’s persistent settings eliminate the export side of that equation. Configure once, export reliably, and spend your engineering time on engineering.
CadShift is available at cadshift.com/solidworks-plugin — from $199/yr per seat (Basic) or $799/yr per seat (Professional).