The following information is a single lesson in a larger project. Find more great projects here.

Lesson Overview:

Now we'll do the 3D design for the post!

## Step 1: Intro

At this point in the City of Lights course, you have created the circuitry behind a pressure sensitive roadway and a row of house lights.
Now the project needs realistic transmission lines and lamp posts! Lamp posts allow a city to live at night, and transmission lines bring power from a far off station and straight to your home! Both of these structures use the same basic design. Let's get started!

## Step 2: Clip

The post is going to have a Circuitscribe 2-Pin Adapter Module at its base. We're going to want to hold on to that module, so we are going to be a clip that snaps on.

1. Change the Snap grid to 0.25mm
2. Drag a box from the geometric panel, place it on the workplane, and size it to be 20.25mm along the X axis, 2mm along the Y axis, and 20mm along the Z axis.
3. Drag another box from the geometric panel, place it on the workplane, and size it to be 3.5mm along the X axis, 10mm along the Y axis, and 20mm along the Z axis.
4. Align this box to the first along the lowest X limit and the highest Y limit.
5. Drag a wedge from the geometric panel, place it on the workplane, rotate it 90° about the Z axis in the positive (clockwise) direction and then rotate it rotate it 90° about the X axis in the positive direction.
6. Scale the Wedge to be 1mm along the X axis, 3.5mm along the Y axis, and 20mm along the Z axis.
7. Center the wedge to the second box along the Y and Z axes, and to the largest limit of the X axis.
8. Nudge the wedge 1mm in the positive direction along the X axis and 0.75mm in the negative direction along the Y axis.
9. Group the wedge and the second box to make the barb that will capture the Circuitscribe module.
10. Duplicate this barb and align it to the upper X limit of the first box, then use the mirror tool to reflect it across the Y/Z plane (so the barbs point inward.)
11. Continue to the next step.

## Step 3: Pole

Now it's time to make the poles.

1. Drag a cylinder from the geometric panel, place it on the workplane, and rotate it about the X axis 90° (in either direction).
2. Move the cylinder -2mm along the Z axis.
3. Scale the cylinder to be 9mm along the X axis, 95mm along the Y axis, and 9mm along the Z axis.
4. Center the cylinder to the box along the X axis, and align it to the box's lower Y axis limit.
5. Duplicate the cylinder and rotate in 90° about the Z axis.
6. Center the new cylinder to first along the X axis and align it to the first cylinders upper Y axis limit.
7. Nudge the new cylinder 4.5mm along the Y axis in the positive direction so that the top of the original cylinder has a nice tangent relationship with the circumference of the second cylinder.
8. Continue to the next step.

## Step 4: Fixture

We're going to be making ends that are keyed in such a way as to take lamp covers for street laps, but also allow the poles to function as transmission lines. Whether it's for holding a light or for securing a transmission line, it's called a fixture!

Whether it's for holding a light or for securing a tranmission line, it's called a fixture!

1. Drag a cylinder from the geometric panel, place it on the workplane, and size it to be 14.5mm in diameter and 2.75mm along the Z axis.
2. Duplicate the first cylinder.
3. Press and hold the ALT key on the keyboard and scale the duplicate to be 13mm in diameter. Then, without pressing the ALT key, scale the duplicate 5mm along the Z axis.
4. Duplicate the cylinder again.
5. Press and hold the ALT key on the keyboard and scale it to be 12mm in diameter. Then, without pressing the ALT key, scale it to be 9mm along the Z axis.
6. Convert the tallest cylinder into a hold and then group it with the second cylinder. This will result in a tube that is 13mm in diameter and has a 0.5mm thick wall.
7. Group the tube with the original cylinder.
8. Continue to the next step.

## Step 5: Align Fixture

Now we'll position the fixture to the end of the post.

1. Rotate the fixture 90° about the Y axis in the positive direction.
2. Center the fixture to the horizontal pole along the Y and Z axes, and then align it to the pole's upper X limit.
3. Nudge the fixture 2.5mm along the X axis in the positive direction.
4. Continue to the next step.

## Step 6: Terminal

We are now going to make a terminial, or end point of a power or signal line. This is where the wires will end and where an LED or transmission line will connect.

1. Drag a box from the geometric panel, place it on the workplane, and size it to me 20mm along the X axis, 2.25mm along the Y axis, and 1.5mm along the Z axis.
2. Duplicate this box and nudge it 3.25mm along the Y axis.
3. Group these two boxes and change them to a hole.
4. Center these boxes to the fixture along the Y and Z axes, and align them to the fixture's upper X limit.
5. Group the holes to the fixture and then duplicate the fixture.
6. Rotate the fixture 180° about the Y axis and align it to the opposite end of the pole (the lower X axis limit.)
7. Nudge the fixture 2.5mm along the X axis in the negative direction.
8. We'll need another copy of the fixture for later, so duplicate it and drag it out of the way.
9. We want to cut the terminal slots deep in to the pole, so ungroup the two fixtures and then group the two fixtures, the four terminal slots, and the two poles together.
10. Continue to the next steps

## Step 7: Trim

We're going to need to be able to 3D print this laying down, so we're going to make the back of the lamp post flat.

1. Drag a box from the geometric panel, place it on the workplane, and size it to be wider than the post along the X and Y axes.
2. Move the box -20mm along the Z axis and turn it in to a hole.
3. Group the box and the post so we trim the part of the post beneath the workplane.
4. Continue to the next step.

## Step 8: Conduit

Now we need to add a path for the cables to be routed. This is known as the conduit.

1. Drag a box from the geometric panel, place it on the workplane, and scale it to be 4mm along the X axis, 95mm along the Y axis, and 4mm along the Z axis.
2. Duplicate the box, rotate it 90° about the Z axis, and then scale it along the X axis to 90mm.
3. Center the duplicate to the original along the X axis and align it to the upper Y axis limit of the original box.
4. Nudge the duplicate 2mm along the Y axis and then duplicate it.
5. Press and hold the ALT key on the keyboard and scale the new duplicate along the Y axis to be 5.5mm
6. Grab the duplicate's lower X axis scale handle and then scale it to be 15mm along the X axis.
7. Duplicate this box and align the duplicate to the horizontal pole's lower X limit.
8. Group these 4 boxes and turn the group in to a hole.
9. Center this group to the poles along the X axis and align it to the poles' lower Y axis limit.
10. Group these together.
11. Continue to the next step.

Now we'll cut a hole in the clip that will allow us to route a wire from the connector on the 2-Pin Adapter module, through the conduit, and to terminal.

1. Drag a box from the geometric panel, place it on the workplane, and scale it to be 2.5mm along the X axis, 20mm along the Y axis, and 15mm along the Z axis.
2. Turn this box into a hole and center it to the poles along the X axis and align it to the pole's lower Y axis limit.
3. Group this box, the poles, and the base, together.
4. Continue to the next step.

## Step 10: Reflector

We'll now be making the reflectors for when we want to make a lamp post.

1. Drag a round roof from the geometric panel, place it on the workplane, and size it to 24mm along the X axis, 20mm along the Y axis, and 14mm along the Z axis.
2. Drag a half-sphere from the geometric panel, place it on the workplane, and size it to 24mm along the X axis, 20mm along the Y axis, and 14mm along the Z axis.
3. Center the half-sphere to the round roof along all axes, then nudge the half-sphere 10mm along the Y axis in the positive direction.
4. Duplicate the half-sphere and nudge it 20mm along the Y axis in the negative direction.
5. Select the round rood and one of the hemisphere’s and duplicate them.
6. Group the duplicate and nudge it out of the way.
7. Size the duplicate to be 20mm along the X axis, 30mm along the Y axis, and 10mm along the Z axis, then turn it into a hole.
8. Center the hole to the reflector along the X axis, and align it to the reflector's lowest limits on the Y and Z axes.
9. Shift click the reflector (to deselect it) and nudge the hole 2mm along the Y axis in the positive direction.
10. Group the hole with the reflector.
11. Continue to the next step.

## Step 11: Fixture Socket

To make the reflector fit the fixture, we're going to remove a slightly oversized fixture shape from it.

1. Rotate the free fixture 90° about the Z axis in the negative (counter clockwise) direction.
2. Drag the fixture close to the reflector and then center the fixture to the reflector along the X axis.
3. Ungroup the fixture three times and then delete the two box shapes.
4. Scale the largest in diameter cylinder to 3.5mm along the Y axis in the negative direction. Then, press and hold the ATL key on the keyboard and scale it along the X and Z axes to 16mm.
5. Scale the medium diameter cylinder to 6mm along the Y axis in the negative direction. Then, press and hold the ATL key on the keyboard and scale it along the X and Z axes to 14.5mm.
6. Scale the smallest diameter cylinder to 12mm along the Y axis in the negative direction. Then, press and hold the ATL key on the keyboard and scale it along the X and Z axes to 13mm.
7. Finally, scale the smallest diameter cylinder to 25mm along the Y axis in the positive direction.
8. Select all three cylinders, turn them in to holes, and group them.
9. Continue to next step.

## Step 12: Key

Because the lamp post is keyed, we're going to make the fixture hole shape keyed as well.

1. Drag a box from the geometric panel, place it on the workplane, and scale it to be 20mm along the X axis, 27mm along the Y axis, and 20mm along the Z axis.
2. Center the box to the cylinder group along the X and Y axes, then nudge the box 12.5mm along the X axis in the positive direction.
3. Turn the box in to a hole and group it with the cylinder group.
4. Continue to the next step.

## Step 13: Align

And now we'll carefully align the fixture key to the reflector.

1. Align the keyway to the reflector's upper Y limit, then nudge the keyway 8mm in the positive direction along the Y axis.
2. Group the reflector and the keyway.

## Step 14: Make a Mirror Copy

Now we just need to copy and mirror the reflector so we have one for each side!

1. Duplicate the reflector and nudge it until it no longer overlaps with the original.
2. Mirror the duplicator across the Y/Z plane so that the keyway become reversed.
3. Continue to the next step.

## Step 15: Print Your Lamp/Transmission Pole

You can, at this point, decide if you want to print the reflectors for a lamp or remove them for a Transmission Pole. This print does have overhangs, but they are ideal so should be fairly easy to print and not require support structure.

2. Select the STL print option.
4. Print!

## Step 16: Circuit Scribe Lamp/transmission Pole

In your City of Lights model, you will need to create at least two transmission poles and three light posts.

Go back to the previous step and make sure you have enough materials! In the next lesson you will learn how to thread wires and LEDs into the transmission poles and lamp posts, and put them into your city model.

In the next lesson you will learn to print the 3D design!

Next Lesson:Lamp Post and Transmission Pole - 3DP