Here's something I did some time ago and haven't had time to use or work on since then until this week when I pulled it out of the drawer for testing.



It's a fully printed power hacksaw, well, except motor, blade and screws... but you get the idea.
In the video it's cutting a 1/4 inch thick by 2" wide aluminium angle extrusion, that is a bit of a torture test for the tool; it takes a very long time to go through it but it does the job.
A more powerful, faster motor should be better, this turns at 60RPM, 120 would be much better.

It's still a work in progress, there are some things I would change in the design, specially find a good clamping system and add ball bearings in some of the hinges. There's already a provision for a switch to turn off the motor when the saw finishes cutting, it's installed but not wired at the moment.