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Some printer control boards receive power via USB when connected to a PC or OctoPi, which forces the printer's control board to stay powered on even after the printer has been turned off. This is a nuisance when you want to turn everything off (hard reset, firmware update, etc.), so a DC blocker is handy to have.

This model is a 2-part case that holds standard PC-mount (printed circuitboard mount) USB A connectors (male and female). The 5V DC pin is removed on both connectors and the other pins are soldered straight through.

Tips on Assembly:

Parts:

use standard PC mount USB male and female connector parts
print one complete set (body and lid) for each USB DC Blocker you intend to make

Preparation:

plug/join the male and female connectors together at this point
- makes removing the correct pin easy to track
- see the USB pinout to identify the 5V pin
remove/pull the 5V DC pin from both the male and female connectors
bend the PC mount tabs flat (see pictures)
carefully bend the remaining pins out flat (see assembly pictures)
put the unsoldered connectors into the body
- dry-fit the lid to set the spacing before soldering
- bend the pins as required to make soldering easier
  - i.e. they should be touching and aligned with each other

Soldering:

place a small dab of solder flux on each pair of pins (optional, but recommended)
use as little solder as will do the job
- don't bridge solder between the pins
after soldering the top, remove the assembly from the body
- lightly solder the bottom of the pins
- make sure you have good solder flow all around
- allow each pin to cool fully before flowing the next one
  - otherwise the spacing/shape will be lost

Testing (before final assembly):

connect DC blocker into OctoPi, plug USB cable into DC blocker and connect to printer
- printer\u2192USB Cable\u2192DC Blocker\u2192OctoPi
make sure you can still connect to the serial port
- perform homing operations, etc
If trouble, check with multimeter/continuity beeper
- make sure all 3 signals are connected between USB connectors
- make sure there are no shorts between pins
Test that powering off printer also powers off the board

Final Assembly:

Place the soldered connector assembly back in the housing body
carefully put a dab of hot melt glue into/onto the middle of the connector assembly
- careful not to use too much
- use work gloves (cotton or leather) to avoid nasty burns from the hot melt
quickly push the lid into place and hold tightly until hot melt hardens
- make sure the tabs go into the right recesses on the connectors

Re-test. If it still works, you're done.

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USB DC Power Blocker

Model files

usb-dcblocker-body stl

usb-dcblocker-body stl

usb-dcblocker-set stl

usb-dcblocker-set stl

usb-dcblocker-lid stl

usb-dcblocker-lid stl

usb-dc-blocker-case fcstd

usb-dc-blocker-case fcstd

Model origin

License

usb-dcblocker-body
stl

usb-dcblocker-body
stl

usb-dcblocker-set
stl

usb-dcblocker-set
stl

usb-dcblocker-lid
stl

usb-dcblocker-lid
stl

usb-dc-blocker-case
fcstd

usb-dc-blocker-case
fcstd