Plane and Simple

The main body of my Lego brick , I need a rectangular prism. First, I clicked Create Sketch and selected a plane. Then I selected Create and 2 point Rectangle or click R to create a rectangle. After creating a rectangle, I used Extrude (click E) to change the rectangle into rectangle prism. 

There're several circular knobs on the rectangular prism. To make these knobs, first I used diameter-center circle or clicked R to make a circle.  Next, I used Dimension or (click D) to make the distance between the circle and edges of the circle fixed. Then I used extrude to add thickness to the circle.

I needed to duplicate the knobs I just made. I went to Create drop down menu and selected Rectangular Pattern feature. I changed the Pattern Type to Features to easily select the whole knob. For the Directions, I selected one of the edges and I typed out the number of copies I wanted. I also needed to set the space between the knobs. Check the preview and click OK to finish. 

I used Shell command from the Modify dropdown list to hollow out the body. For the Face/Body, I selected the bottom face because that's the area I need to hollow out. Then I typed in the inside thickness and it would give me a nice preview of the shell. Click OK to confirm the result. 

For the bottom columns, I first selected the inner plane of the brick. I used Create Sketch and create two construction lines ( click L ) for reference purpose. Then I created a circle that was tangent to the holes. I created another circle inside the circle I had just created. 

I went to Extrude and selected the the circle which automatically excluded the area of the inner circle. Next, I typed in the thickness that I wanted and one column was done.

I used the Rectangular Pattern Feature to duplicate the column. The Pattern Type needed to be Features. I selected the column I made and selected the edge and typed in the number of copies I wanted. The three column were finished.

After I completed the overall Lego brick, the last thing I needed to do was to add fillets to some of the edges. Adding fillet is to make sure that the edges are not sharp. I went to Modify dropdown list and selected Fillet command (click F). I selected the lines that I wanted and adjusted the fillet width. The fillets were added onto the edges.

Use Create Sketch and select Text. I typed in my name. I used Extrude and type in negative numbers in order to make my name embedded in the surface of the brick. The Lego Brick was done!

Home view

I went to Create Sketch and selected 3-Point Arc command. I selected a spot on the vertical symmetric line and another point on the horizontal one. After creating a satisfying arc, I needed to copy the arc I had just made. I went to Create and selected Mirror. I selected the arc and chose the horizontal symmetric line as me Mirror Line. Then the right half of the circle had the arcs. I repeated the process to get my left part done. The only difference was that I selected two arcs at a time. I also needed to use the vertical symmetric line as the Mirror Line. 

I needed to limit the distance between the circle and  the arc so that the 3D printer would be able to print it. I selected Dimension (click D). Before I selected anything, I right clicked and selected Pick Circle/Arc Tangent. Then I picked the circle and the arc and it would create a distance between them. Next, I put the distance I wanted to be and clicked Enter. Now I changed the dimension into what I wanted.

After creating the arcs, I dragged the corner to  change the size of the arcs. I selected Fillet command under Modify. There would be an arrow after selecting the two arcs. I could drag the arrow and see the change of the fillet. I chose a dimension. I held Ctrl and selected the opposite two arcs in order to make the two fillets symmetric (the other would change if one is changed). I did the same thing to the other pair of arcs. 

Now I needed to change my width. I selected the Dimension and chose two endpoints of the opposite two arcs. I changed the dimension. It might look very strange. I could use Constraint to fix it. I selected Symmetry under Constraints menu. I selected the two opposite arc and the vertical symmetry line and it automatically changed the arcs into symmetric shape. I changed the height in the same way. 

After I  finished the sketch, I could change it into 3D. I selected Extrude and put whatever thickness I wanted and the book holder is almost done.

I added some fillets onto the edges of the book holder. I selected Fillet and dragged the arrow to see the change of the fillet. I chose the width I wanted and locked the number.

In order to hold the book holder more comfortably, I added the fillet to the hole so that the edge wouldn't be sharp.

Left Side view

First, I selected the whole mesh and went to Mesh tab and selected Generate Face Groups in the Prepare dropdown list. I changed the type to fast so that the computer wouldn't break down. I clicked Preview to see the modified product.

I went to Modify under the Mesh tab and selected Covert Mesh. I changed the Method into Prismatic and clicked OK. The mesh was converted to a solid body.

I chose to add a text on the back of the ghost keychain as the modification of the product.

I selected Create Sketch and a plane and choose Text.

I typed down Halloween and changed the font. Then I changed the position of the text to make it in the center.

I used Extrude command to add a thickness onto the text so that the text was imbedded in the body of the ghost.