Here is a quick and simple Instructable about how to make a small USB powered engraving pen.
Mobile users can find the video from here.
Step 1: 3D Desing Case
The case is 3D printed just to make the parts snap on right size.
You could use a pen's hollow tube with this also.
Printed with Printrbot makers kit. 0.4mm nozzle and 0.2 layer height and 30mm/s speed.
Step 2: Parts
Parts needed are:
-Tube to act as a pen
-A tiny motor.
Step 3: Make a Hole for the Button
I made this tube just to show how to make the same thing with a normal pen.
Just cut a hole with anything you think is suitable to get the job done.
Measure the button used first to get it right the first time.
Step 4: Electronics
Insert a motor to the other end of the tube. Mine is measured for that motor. Use hot glue if needed.
Peel the cables and heat up your soldering iron.
Step 5: Solders
The connections are pretty simple.
Solder motor negative to USB negative and cover it up.
Solder motor positive wire to the button and USB positive to the other end. Cover the wires with hot glue to make sure there is no short circuit.
Step 6: Glue Up
Use hot glue to attach the button to the hole you made.
Also hot glue the cable end of the engraver to secure it in its place.
Optionally you can use shrink tube to make the USB cable more secure.
Step 7: Done
This is pretty simple thing to do.
But this works pretty well on soft metals and plastic. Easy to hold in hand and finger operated on/off button.
Watch the video to see the engraver in use.
Thanks for reading!