D4E1-DB-Penopener

I made a device that can open and close markers and pens. The device was made for someone with a physical disability who has a lot of need to open pens. When you push the red button, the pen is clamped in the device and the pen is then pulled apart. If the pull is still not enough, one can turn the large lever, which twists and pulls the pen apart.

• Lego Minstorm EV3
• a lot of lego
• special pieces: 4520872 ; 2x 4528037 ; 6x 4211510
• bicycle tyre
• 3D printer

Print one of the following pieces 4 times. This depends on how big your markers are. If you have thicker markers, it is best to print the smallest piece. When 3d printing, make sure the hole in the middle can be used by a lego stick. Every 3D printer is different, so you may have to adjust this.

Make the gearingsystem like on the photo's

Make the movable clamp like on the photo's

Make the movable clamp with gearingsystem like on the photo's

Make the pushsystem like on the photo's

Make the second clamp like on the photo's

Make the second clamp and pushsystem like on the photo's

Make the stand like on the photo's

Make the pen-opener like on the photo's. Add pieces of tyre of an old bicycle above the 3D printed piece, so that the pen will be better clamped.

You can simply add some robber on the bottom of the machine to add some stickyness.