Shawn's original Scraper & Double Razer Blade model includes a very nice handle, but it was slightly narrow for my blades. Originally I simply scaled his up by 2.5%, but I was printing multiple handles and decided to flatten the model so I could print it without supports.
This is my remix of the handle that prints flat and can accommodate blades up to 40mm.
The blades I use are Scraperite, which are advertised as 1.5" but actually measure 1 9/16"
switching to metric, that is just about 39.7mm (Shawn's handle is 39.2).
My remix has a space modelled to 40.12mm, which measures 39.99mm for my Prusament PETG prints. It might still be tight for true 40mm blades, but easily accommodates 1 9/16" ones.
If you do not mind using supports and have a blade that fits the original, please print Shawn's. The handle is more ergonomic and his is the original design.
The author remixed this model.