This is a snap together design to print your own window grid.

• Parts are divided to easily fit on your printer bed.
• Use the parameters to configure to match your window size.

I originally designed this to make window frames for my tardis. 

Instructions:

• If you want dovetails, download JointSCAD and place in your working folder. https://github.com/HopefulLlama/JointSCAD
• Enter your window dimensions and parameters below.
  • Horizontal measurement of opening
  • Vertical measurement of opening
  • Number of Panels in each row
  • Number of Panels in each column
• Export stl and use your slicer to divide into individual objects to print.
  • In PrusaSlicer, click the "Split to Objects" button. (not the Split to Parts button).
  • Press the A key to arrange parts to best fit your bed.
  • Print your first tray, then delete the printed parts, and press A again to arrange the remaining parts to print.
• Assembling, the joint fits are tight.  Use a hammer to lightly tap the parts together.
• Only the outer frame parts use joints.  The inner parts need super glue.

Fast Draft Print Settings:

These speed settings reduce my print times by half and still print flawless shapes.  The only thing I turned down the speed on was the First Layer Speed to 30 mm/s (default).