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• LEGO Blocks are very basic geometric objects. This much is obvious:
  • The basic 2X4 block is twice as wide as long.
  • The round tabs on top accept blocks of any other configuration and have the thickness of 2 walls between them.
  • The barrels inside the body engage the round tabs of the top of any other block..

• Start with a Grid with a value of 1 and a Snap Grid of .25
• Drawing plane should be X-Z
  • Use OPTIONS to set working plane.
• Using Double line mode, right align, and a width of .25 draw a box from top right to bottom left 5 units by 10.

• We know that a 1X2 block fits 4 times on top of this one, so change colors and draw one AS A LINE.

• With a new color draw the 2 circles using 'Circle Tangent to 3 Lines'.
  • The circles should touch the lines exactly.

• Drag a selection window around the small box and circles and set a handle at the point shown.
• Now duplicate this to the lower right corner first, and then to the other 2 spots.

• Drag a small selection window encompassing just the central 4 corners of the small boxes while holding down CTRL. All 4 boxes should be selected.
• Hit DEL.

• Now use Double-line mode and 'Circle Tangent to 3 lines' to draw the 3 center barrels.

• Choose another color and draw a single line box around the whole block.
• Select each entity, or select all of each type as groups and make everything planes for extruding into solids.
  • Command to make line /circle entity a plane is 'Make Plane'
  • Command for Double Line is 'Double Line to Plane'.

• Change to 3D mode.
• Change Grid Plane to X-Y
• Under Options menu, choose 'Set Grid Center' and click on one rear corner of the block.
  • The grid should be vertical to the block.
• Make sure Snap Grid is ON.

• Select the Double-line and the 3 center barrels.
• Hit X for extrude.
• Set a first point on the right rear corner of the block.
• Set a second point on the snap grid 2 1/2 squares straight down.
• Hit ENTER

• Select all the button circles at once.
• Hit X. Set a first point on the right top rear corner.
• Set a second point on the Snap Grid one square straight up.
• Hit ENTER.

• Select the single line rectangle.
• Hit X
• Set first point same as above.
• Set second point 1/2 square straight up.
• Hit ENTER

• In SIDE VIEW drag a selection window around just the tops of the buttons while holding down CTRL.
  • All the buttons should be selected.
• Use SOLID SLICE and check the option 'Selection Only'
• Choose X-Z axis.
• Set a first point on the top right corner of the blue box.
• Set a second point at the bottom corner of the blue box.
• Hit ENTER
  • Just the bottoms of the buttons should be sliced off.

• Select everything and change to a single color.

• Bottom view with light source added.