I have had a bit of look for something that kind of size myself a while back, but came up with nothing. (worthy of its price tag at least)
The Technoprints certainly look the most convincing...
RANT:
Of course all there is no such thing as a PCB with free stencil, those that offer one as such typically charge more and the bigger the board gets the lower the proportional cost of a proper stencil becomes. On top of that the bigger the board in question and/or the higher the level of technology the less suitable the free stencil becomes, taking PCB-Pool as an example a "Free Stencil" has the following specs:
- Stainless-Steel
- 150 µm
- Size to be 10mm (all around) larger than the PCB
- No pad modification
- No finishing
- The paste film data wil be generated 1:1 from your PCB Layout data.
So it is basically
1) Too small -10mm is not that much to grip onto with some kind of mechanism, let alone giving somewhere for the paste to go as it flows.
2) Apertures almost certainly too large for smaller parts that would otherwise appreciate a 5-10% shrink
3)Too thick for anything remotely fine pitch - A board with 0.5mm pitch QFN's would want 100µm
4)Will put down too much paste under QFN, DPAK or something like a TO-252 - A stencil manufacturer would liaise with you, offering you their expertise to get the best results through aperture reduction, hatching etc.
5)Expensive -unless you need really quick turnaround or your board is small its easily cheaper to buy a real stencil elsewhere especially if you factor in the time you might spend finding shorts or dry joints from over-pasting, under-tension or indeed the fact these boards IME are simply not as good as production ones. (I've seen crap tinning, illegible silkscreen, misaligned silkscreen, peeling solder resist and crappy via's)
IMHO they are suitable for small PCB's using very std technology - say 0805 and 1.27mm SOIC's
Now yes, proper stencil frames and printers can be even more expensive (not hugely at the low end) but you could well come to find it's an investment you might never regret. I have seen several establishments in fact, using proper framing systems to paste what I assume were prototypes and simply placing the PCB on the table - presumably the printer was busy or the time needed to set it up not worthwhile.
I apologies for yet another off slightly topic rant, I only see these Free stencils things because customers sometimes provide them, we Never use them for in-house stuff (that may mean I'm spoilt) and where a proper stencil is too expensive we typically use plenty of flux, silver solder, tweezers and a soldering iron. The client who plans to make one of these printers himself gets remarkable results just using a syringe- but then just about anything is possible given the right amount of patience & dexterity.
Perhaps this is one of those rare occasions when we could take inspiration from the USA, they seem to have nicely equipped workshops where enthusiasts, hobbyists, Geeks, & developers etc can come and use proper tools to do things they would not be able to do in their garage. There does seem to be a fairly significant concentration of potential users of such a workshop in the South-East, if a few of you got together you could buy some really quite nice 2nd user kit, share the expense and charge anyone else who wasn't part of the initial splurge a small fee to use it. You could even have little open days where you work on open source hardware projects and the like just like they seem to. It wouldn't surprise me if Farnell or similar could be persuaded to sponsor it (or at least events it could enable) in some manner. With a group of people you could even try to get a dispenser, enabling you to print paste into boards with no stencil needed.