Dovetail Saw

Demo video here: 

This dovetail saw model uses a printed spine which holds the saw plate and a steel rod for stiffness and weight, making it balance like a traditional back saw would.   My version uses a ½" steel rod which can be bought at most hardware stores.  An alternate metric design will accommodate a 12mm rod instead. 

The saw plate is cut from a drywall taping knife, if you do this make sure that you get one made from blue tempered steel, not the stainless kind.  This is the one I used: https://www.homedepot.ca/product/marshalltown-10-inch-taping-knife-molded-handle/1000152346

The handle is made in 3 pieces, there are two versions one meant to be glued together, and another which has screw holes to be put together with either M3 or #4-40 screws, which will self tap into the opposite handle piece.  I used ½" long screws, anything 12-16mm will work (½"-5/8")   A 0.5mm (~.020") centre spacer allows clearance for the saw plate.  

The larger screws that clamp the spine and plate are ¼"-20 in my version, but I've included a handle with the hex cutouts sized for M6 bolts too. 

There are holes for locating dowels, which are optional but would add strength even in the screwed together version. 

I usually design to avoid supports, but with this there was no ideal way to avoid them.  I suggest printing with the inner face of each handle half touching the build plate, and use supports, just for the socket where the spine inserts.  I made mine with PETG and that made cleaning out that socket a bit tedious, but it only takes a few minutes to get it cleared out.