I liked the pen holder. This is a simple and good design.

Create a new sketch for the front side 

Draw rectangles: dimensions 80 mm x 100 mm.

draw a tape and set its dimensions: 10 mm * 3 and

DrawT slots to be: dimensions: 5.5* 2.40 and 3* 10

draw a rectangle to give some appearance 

Create a new sketch for the front side 

Draw rectangles: dimensions 80 mm x 100 mm.

draw a tape and set its dimensions: 10 mm * 3 and

DrawT slots to be: dimensions: 5.5* 2.40 and 3* 10

draw a rectangle to give some appearance 

Create a new sketch for the front side 

Draw rectangles: dimensions 100*50

draw a tape and set its dimensions: 10 mm * 3 and

DrawT slots to be: dimensions: 5.5* 2.40 and 3* 10

draw a rectangle to give some appearance 

and use fillet too to do  in corners

draw the open circle for 3mm screw

After downloading, the design file is in the laser cutting machine. I went to the control box in the laser machine. 

I selected my design file from the machine's memory, and I had to set the machine's starting origin and click "Frame" to ensure that no design elements were missing from the plywood sheet. 

and then test the laser pulse

and then start