Print the body, safety guard and handle of your choice, all without support.
Use high infill in the body for extra strength.
Tip: The handle has an octagonal hole for the body, rotate the part or the infill angle so that roof layer of this hole is printed across the handle to easily bridge the gap.

There is the "Gyrobot's Lame" ;-) handle but I have included a handle without a logo plus a step file if you have access to CAD to personalise your own.

To assemble:
Depending on your printer calibration, you may need to glue the body into the handle (or shave it down if it's too big). The body has a small split line for compression which should help it's insertion into the handle.
The razor blade can be attached in two ways depending on your preference for a curved or straighter blade, please see the two images for this. You curve the blade by squeezing the ends gently and with care.

The safety guard will slide using the natural spring of the blade inside to aid smoothness, it should click home when fully attached.

Please be responsible with this device, razor blades are extremely sharp!!

All lame jokes welcome.