Simple Box with acrylic sheet bottom/top

This simple box allows a piece of acrylic plastic (also called Perspex) to be used at the top or bottom.

The trick is to insert an "@pause" command into the GCODE just before the later corresponding to the later above the sheet.

My PLA print bonded well to the acrylic and the small inset holds the plate firmly.

Edit the top of the scad file to contain the correct dimensions of the plastic plate.