Safety knife for removing tape

I've developed a safety knife for removing duct tape and electrical tape from surfaces. This knife can be attached to a mop extension.

I've attached a link to a replacement blade: https://www.martor.com/en/products/blades/product/trapezoid-blade-no-99.

Video: 

The photos and video show the old version of the knife. The new version uses fewer bolts. 

For assembly, you'll need: a 3mm diameter, 14mm long spring; 2 screws M3x16; 2 screws M3x10 (Conical screw); and two M3 nuts. 

I printed with PLA, but I think it would be better to print with more durable materials like ABS or ASA. 

This is my first design in Printables, so please support me with a like. 

I'd be very grateful if you could buy me a coffee

It would motivate me to continue working on my projects, of which I've already accumulated quite a bit. I'd appreciate any criticism in the comments. 

Thanks everyone.