There was a mountain of packages that occupied a whole drawer in the kitchen. And now there is a small box with packages. The whole secret is to roll packages with a simple device.
The author of the idea is Andrey Shayter https://www.youtube.com/watch?v=HEacniKGmWM
Simplified version from Steve Genom https://www.youtube.com/watch?v=1tVot6UQgAQ
A simple planer from an old chisel, a couple of pieces of wood and two pieces of plexiglass.
This device helped me to saw a bundle of rolled metal at an angle of 90 degrees without effort.
This is my first CNC machine assembled with my own hands from available materials. The cost price of the machine is about $170.
I need a tachometer to calculate some mechanisms. For example, to calculate the speed of a robot vacuum cleaner, you need to know the rotation speed of the electric motor and, based on this, calculate the gear ratio of the gearbox.
I decided to try how my homemade 3D printer will cope with small models, for this I chose mini-toys and printed them.