Setup: units, alloy, presets and new files

Set units to millimetres, pick the default alloy, apply presets, choose what a new file opens with, switch the 3D view's navigation and find the Help panel.

Written for version 2.18.0Updated 28 October 2026
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Setup holds the choices that outlive a file: the units, the default alloy, presets, what a new Blender file opens with and how the 3D view moves. Most of it you set once, when you install the add-on.

The Setup panel: units, default alloy, presets and what new files open with
Setup: units, alloy and what new files open with

Where to find it

CAD/CAM tab > Setup section. It holds the Setup panel, with New Files Open With inside it (closed), and the Help panel. Menu: Jeweller > Setup. The first two rows of Start Here show the units and the navigation. The add-on’s own settings are under Edit > Preferences > Add-ons > CAD/CAM Jeweller.

The CAD/CAM sidebar with the Setup section chosen: the Setup panel with its units line, default alloy, Presets and The book's course button, above the Help panel, whose first line reads CAD/CAM Jeweller 2.18.0
CAD/CAM tab > Setup

Use it

Step 1. Check the units

Wherethe Setup panel, the box at its top.

Doread the line. If it is red, click Set Units to mm.

You should see“Units: mm (1 BU = 1 mm)” with a tick. Every tool works at 1 Blender unit = 1 mm, so what you model is what you print and cast. The status bar says what the units were before.

Step 2. Choose the default alloy

Wherethe Setup panel, the Default alloy list.

Dopick an alloy. It starts at 18ct yellow.

You should seeweights in that alloy for any object with no alloy of its own. Claws, bezels, rings and pave each keep their own alloy list, so this one does not retune them.

To add an alloy of your own, open Edit > Preferences > Add-ons > CAD/CAM Jeweller, find the My alloys box and click Add Alloy. Type a name and a density in g/cm3. It joins the Alloy lists. A name the book’s table already has is refused, with the reason shown under the row.

The My alloys box in the add-on's preferences: one alloy row with a name and a density in grams per cubic centimetre, the Add Alloy button and the line saying the book's table is never changed
Edit > Preferences > Add-ons > CAD/CAM Jeweller > My alloys. The alloy shown was added for this picture

Step 3. Apply a preset

Wherethe Setup panel, the Presets menu.

Doopen it and choose one of the seven: Solitaire 6.5 round, 4 claws, Pave line 1.2 mm, Halo 1.3 mm, Court band 4 mm, Book sizing shank, Micro pave 1.0 mm or Tube setting 3 mm.

You should seethe matching panels change, and the status bar says how many fields were set. A preset overwrites those fields at once, so Ctrl+Z is your way back.

The Presets menu opened from the Setup panel: Solitaire 6.5 round 4 claws, Pave line 1.2 mm, Halo 1.3 mm, Court band 4 mm, Book sizing shank, Micro pave 1.0 mm and Tube setting 3 mm, with Save Preset at the foot
Setup > Presets

Step 4. Choose what a new file opens with

Wherethe Setup panel, New Files Open With. Click its header to open it.

Doopen the list and choose Blender’s Start File, Finger Rail, Box or My Object.

You should seefields for your choice. Finger Rail gives a size system (UK, US, EU or JP), a size and a Finger switch. Take the Size from Rings copies the size from the Rings panel. Box gives Width, Length and Height. My Object is the selection you saved with Use the Selection. Add to This File puts it in the open file now.

The Setup panel with New Files Open With open on Finger Rail: the size system and letter, Half and Finger, Take the Size from Rings, Leave Out the Rest and Add to This File
Setup > New Files Open With

Step 5. Choose how the 3D view moves

Wherethe second row of Start Here, a button that reads “Navigation:” and your current setup, or Jeweller > Setup > Navigation and Units….

Doin the window CAD/CAM Jeweller: Set Up, click Hamed’s Bench or Blender Default. Leave Millimetres and grams in this file and new files ticked. Click Use This Setup.

You should seethe status bar say which you chose. Hamed’s Bench orbits with Alt and a left drag, and turns the view about your selection. Blender Default uses the middle mouse button. Keys and menus compares the two.

The one-time Set Up window asking how the 3D view should move, with two choices side by side and a Use This Setup button
CAD/CAM Jeweller: Set Up

If it goes wrongto change it later, or to go back, open Edit > Preferences > Add-ons > CAD/CAM Jeweller. The Bench setup box has both buttons and Put Back My Previous Settings. If Blender does not save preferences when it closes, the status bar adds “Save Preferences to keep it”.

Step 6. Find the Help panel

Wherethe Help panel, below Setup.

Doread the version line. Click hamedarab.academy to open the site in your browser.

You should see“CAD/CAM Jeweller 2.18.0”, the buttons Open the Cheat Sheet and hamedarab.academy, the line “Licence: GPL-3.0-or-later”, and two closed sub-panels. Hotkeys lists the keys the add-on adds. Standards Used names the book and the page each section of standards cites. The Setup panel also has The book’s course, which opens the book’s page.

If it goes wrongin an installed copy Open the Cheat Sheet opens nothing. It shows a warning, because the cheat sheet does not ship inside the add-on. Read Keys and menus instead.

Settings

SettingDefaultWhat it changes
Default alloy18ct yellowThe alloy for any object with no alloy tag.
A New File Opens WithBlender’s Start FileNothing is added. Finger Rail, Box and My Object add one thing.
Start railUK M, Finger onUK letter, with a Half switch. US starts at 6.25, EU at 52, JP at 12.
Start box20 by 20 by 20 mmWidth (X), Length (Y) and Height (Z). 0.1 to 1,000 mm.
Leave Out the RestOffIn a new file, takes out the start file’s own meshes and curves. Cameras, lights and pictures stay.
Millimetres and gramsTicked in the Set Up windowThis file, and new files, open in millimetres and grams. Files you open keep their own units.
Guides on when placingOnPlace Gems switches the guides on when it starts.
Follow the ToolOnStarting a tool by key or menu shows its section. Never while All is chosen.

Good to know

  • The add-on does not write Blender’s start file. To change that instead, set the scene up and use File > Defaults > Save Startup File. File > Defaults > Load Factory Settings goes back to Blender’s cube, camera and light.
  • Hamed’s Bench is Blender’s own Emulate 3 Button Mouse, Orbit Around Selection and Spacebar Action set to Tools. Nothing else changes, and Put Back My Previous Settings restores what you had.
  • The choice of start file and your saved start object survive an update of the add-on.