Using aluminum handle squeegee for screen printing
It is important to always clean your squeegee blade right after use so that it would not absorb moisture and any solvents that you have use. Never let it sit on a solution so that it would not get into it. Also, you might want to give your squeegee enough time to dry out before using it again. For mass production, you should have another blade in which you can use for rotation while you are cleaning the other one.
When you are using an aluminum handle, since they are quite easy to actually clean and their blades can more easily be swapped and at a faster rate to, all that you really need to do is find the right design that will fit right in your hands. It would make the work easier for you if the blade fits in your hands.
Aside from the first two, it would also be great if you can choose the right type of squeegee to use whether it be a neoprene bade or a polyurethane blade so that you would get all the advantages you need on using and printing your shirt.