Designed this for the wife's work contest. 

This is a glue together design, you can add as many of whatever pieces you want. 

I will update this model with other parts as I design them. 

Print settings

• .2 layer height
• no supports
• 13% infill 

The opening for the pieces is 15 x 10, the insert pegs are 15 x 9.6 to allow for glue etc.. 

Main column is 40mm with 43mm lips if you design another toper etc..