Framed:
(if you order cheap, you probably get the bottom version)
Not Framed:
(polymide)
(stainless)
Applying paste as hobbyist:
There is lots of material and guides out there about this.
Some/most fabs/aggregators that offer stencils also offer some pcb material that will act as alignment help/spacers round the stencil when you put it onto a flat desk and hold the whole thing together with self adhesive tape.
As hobbyist you probably want to get stainless, non-framed and either use some old pcb boards or get the custom spacers from the website that sells the stencils to make your life easier.
Tape everything in place, tape the stencil along one edge (longest is best, avoid bottom edge) to be able to do a couple of boards right after each other.
Also important is the rake/scraper.
I use an old small stencil I don’t need anymore for this.
It needs to have a sharp edge that is clean and straight.
The desk you do this on needs to be flat and firm. You don’t want any flex in there.
The paste should be smooth and not stiff. Try to rake under and angle to not trap air in the pad corners.
The tinier your pads (and thus the holes in your stencil) the better your technique and tools need to be (not to mention paste), to get a successful outcome.
After you got this part mastered there is:
- populating of the pcb with SMD (ideallysome sort of suction pump assembly)
- reflowing the whole thing (ideally some sort of oven that can ramp up to the needed temps in the needed times - see paste manufacturer and SMD datasheets for details)
