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.
I decided to try how my homemade 3D printer will cope with small models, for this I chose mini-toys and printed them.
This device helped me to saw a bundle of rolled metal at an angle of 90 degrees without effort.
Today, instead of round guides, the printer received square, using a conventional aluminum profile tube with a cross section of 20 * 20 mm. Bearings roll along the pipe 623zz. All plastic parts were printed on the same printer before it was altered.
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.