I wanted a pen holder but didn't find just the right for me. So I put myself to work and designed this one. It is inspired by Mario's piranha plant and also serves as a cable organizer to charge your phone. The plant can also be used to put some pictures or notes.
It's very easy to print and assemble. You'll only need:
-One 3Dprinter spring (max 8mm outer diameter, 20mm long) like this one
-A microUSB cable or one that fits your needs like this one or this one
Instead of glue you can also use a M3x10mm countersunk screw and nut to fix the base.
Thanks to banggood for sponsoring the design!