Printable frame for mounting canvases.
Minimum size without scale 200mm x 200mm. Maximum, pretty big. (mine is 1500mm x 700mm)
Increases by 100mm or 200mm increments based on which extensions you use. (or cut in your slicer and make what ever size you want)
Parts are 20mm wide and 30mm deep.
Recommended use at least 5 base or top layers. Then you can use that layer on the back and staple the canvas directly to the frame.

Very tight tolerance. So its not sloppy. I had to use a little gentle persuasion to get them together.
I would advise a test print of 2 small parts and test they join, in case you need to adjust any of your settings like elephant foot.
These printed perfect on my Neptune 4 and AD5X but on my Ender 3 V3 SE the parts would not go together.