CISS is very popular nowadays. In fact, it is even cheaper than to use 3rd party ink cartridges. However, printer makes like Epson would want to make life hell for you because they insist that 3rd party ink are pirated and they are losing money selling you printers at hundreds of dollars. Whether you believe this or not, CISS is the way to go.
This model I am particularly talking about is the Epson entry level TX100. The difficulties in fitting in CISS is that it has 3 closed compartments and moving in bettwen them doesn't give much room for the CISS tubes. In fact, Epson ensure you have make a mess by moving the printer head occasionally at high speed from left extreme to right extreme just to tear our your tubes. Plus, the 2 compartments have plastic blocking any 3rd party objects so that when the printer detects a lag in the movement of the print head, it will refused to print. Anyway, people who had modded this will know what I meant.
I had found a way to put in the CISS without cutting off any parts of the printer. Well, there are some ways that involves sawing off part of the plastic, but I will show you why you do not need to now.
Firstly, you will need to get cheap holders like the ones shown in the diagrams below. Make sure they stick well. Do not bother with expensive mounting tapes. I had tried 3M's super heavy weight, the tube just come out with the movements. Lets first identify the secret of how this is going to work. We are going to put the tube over this small hole as shown here :
Next, we will mount the first point as shown:
After putting in the first clip we need to put one or 2 more at the other side as follows :
I would suggest we have these 2 reversed holding. the inner one holds down (to prevent springing up) and the outer one hold up (to prevent falling into the rail track).
As for the remaining, just make sure you measure and allow or the print head to move in right and left extreme. Then tape the remaining as follows :
For the last portion, notice I did not use the clips because it will rise the scanner and you may find that you cannot close properly. Just normal mounting tapes will be good for this.
In addition, if you want to, you can find a compartment behind the printer. Open it and you will see a white tube. Take that out and connect it to a waste ink container (which you can make from CD cake box etc). However, even if you do so, the printer will eventually complain the waste ink is full. You will still need a software to reset it before you can use it.