This is an upgrade (push button) of this project: http://www.thingiverse.com/thing:2152729
In this upgrade i used a mechanical push button with square section with a very efficient lock system.
The idea was: no solder, all plug & play.
U need only sold a small copper/silver/brass to negative drip cap ring: all the rest is plug & play.
body_squared_push_button_dripcap_hole_10_mm: body with drip cap hole 10 mm (fat daddy)
body_squared_push_button_dripcap_hole_12_mm: body with drip cap hole 12 mm (mav)
bottle_spacer: the spacer for soft round bottle
fat_daddy_pin_locker: if u use fat daddy v5, u need this to block the pin contact
front_panel: the front panel
square_base: push button base
top_cap: push button top
locker: push button locker
locker_big: push button bigger locker (to use if locker is too small for your hands)
To complete u need:
If u need a photo-tutorial u can follow this one > http://www.esigblog.com/box-mod-bottom-feeder-mini-meccanica-foto-tutorial/
If u need extra push button assembly explanation u can take a look to the shots in this project: http://www.thingiverse.com/thing:2212825
Suggested print setting: 150 micron (0.15 mm) for body and panel, 100 micron (0.10 mm) for push button parts.