@mike_58: I understand that your version doesn't use a stepper but a DC motor and the motor is rotating as long as you press the key. Correct? Honestly, I was/am tempted to give it a try, but the 3cm max stroke in combination with the improvised cable ties attachment made me stop.
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My version IS USING A STEPPER !! 5V NOT DC motor!!
With abt. 3cm stroke you can do plenty of PCBs - it is a lot of paste.... I can say you can discharge almost all from typical syringes that are sold on the market (or sold by Farnell) including Chinese paste.
It is about 5-7mm missing to discharge all from syringe - you can add in a plastic toothpaste plug and you will discharge all ...
See photo here:
The advantages I see are :
- No noise (no compressor), 5V stepper motor is very quiet
.
- Easy to handle - small size,
- you can plug down the needle and leave it for next PCB..,
- Simple easy power supply 5V charger + USB cable (you can use USB from computer,...)..
- Cable ties look strange but -this is the only way to keep it simple and low cost, I had previous model with aluminium holder but costs... and than you are limited with syringe size - diameter and.... problems start...
- and stepper motor with gearbox is strong -no maintenance needed, ...
I think it is handy all-doe not very fancy looking - but it was made for use not for beauty contest
Try it out ....
http://www.ebay.com/itm/271979673060?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649Larger and nice looking (as well 5V stepper but larger motor+gearbox) I have here : but not on eBay where I sell my.... photo attached: Ask for price to my email-.....