These strips are designed to let tiles with walls along their edge (instead of on top of a square) to be able to but up against each other. You only need these buffers if you are using the OpenForge edge series.
There are three basic sets here:
- Lines
The lines are the same length as the squares (1x-4x) of the squares on the tiles. - corners
The corners are the same length as the squares (1x-4x) of teh squares on the tiles plus a hub that's wth width of a wall from a wall tile. They can have 1-4 spokes coming off that hub. For most people anything past 3x length with 3 or more spokes is unprintably large. - corner walls
Corner walls are the same as corners, except they also have a wall height spoke going up. These are designed to fill in gaps between walls butted up against each other. In most cases, only 1 or 2 spokes are actually useful, but all are uploaded for completeness.
You can find this set on thingivese