DIY PCB Bubble Etch Tank

Step 2 Mount the bubble tube

The tube will hopefully share bubbles through a lot more than one hole, IF the holes aren't too big. The sum of all the holes if you think about it, cannot be greater than the diameter of the pump's outlet, otherwise some holes will go un-used.


The holes, are just short of 1mm and on an initial test in a glass of water, all seem to function. As a tip, not all holes will output bubbles if the tube is not completly horizontal. This is because of the atmospheric/hydraulic pressures that exist when air is submersed. Ensure this bubble releaser is flat on the bottom

As hot glue doesnt seem to stick to this particular rubber tubing, i've used tape to adhere to it, and then let the glue adhere to the tape (clever huh). Whats even cleverer though is the making of little hot glue bridges that clamp the pipe to the bottom of the container.

Creating the seal is vital! But.. not that hard, just make sure you use PLENTY of hot glue around the joint. If you have more than 1 hour to spare, try sealing it with silicon sealant (the stuff you seal pipes/bathrooms/shower cubicles with). It takes longet to dry but would produce a better (more flexible joint).