These are inserts for an 18-inch 1.6A Porter Cable scroll saw (PCB375SS). Unlike the insert that comes with the saw, these inserts sit flush with the top of the table. I've included three different designs; one has an L-shaped slot like the one that comes with the saw (L-Slot), one has a straight slot (Straight Slot), and one has just a 7mm hole in the center (Hole). My current favorite is the straight slot one.
These do not have the little clips on the bottom and are held in only by gravity. I haven't had an issue with this but if you want those clips, someone else made one like that (https://www.thingiverse.com/thing:2533523).
I printed these in PETG and they are much more rigid than the one that came with the saw because I designed them to be thicker and stronger.