This double edge safety razor attachment gives you the extra reach you need to get that nasty little patch of hair off your back, all by yourself, with your 5 cent classic blade. Designed to fit most 3 piece DE safety razors, simply thread the posts through the holes in the mounting plate on the backshaver head right before screwing the razor handle in place. The razor is held at just the right angle to shave, so long as the heel of the head rests flat against your back.
The Backshaver comes in 3 pieces that will need to be glued together. The connecting pieces may need just a little filing to get a proper fit. The optional Test Fit Mounting Plate can be printed out first, to see if everything lines up with your razor, before printing the entire head.
This design has been tested and works with Merkur 23C and several Gillette Tech razors. Tech razors do not have the side posts, so make sure the handle is on tight enough to prevent the razor from rotating. Unfortunately, my Edwin Jagger did not have enough thread protrusion for the handle. I don't see an obvious solution, with the current design, unless the mounting plate can be thinned down a bit without compromising structural integrity, or maybe counter-boring the center hole to accommodate the handle. If you find that you need to modify the design to fit your razor, the Tinkercad files can be found here:
As I recall, I believe I printed the head with supports but no raft, and the handle with both a raft and supports.