Electronics > Projects, Designs, and Technical Stuff
Mylar Stencil thickness
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jdraughn:

--- Quote from: kony on January 28, 2016, 12:11:51 pm ---Word of advice: don't bother with plastic stencils, especially if not held in frame. 20$ for proper lasercut stainless stencil is very reasonable, for example here: http://www.elecrow.com/laser-cut-pcb-stencil-p-450.html. If you want to save on shipping, use otpion without the frame - it is still stiff more than enough for prototyping.

--- End quote ---

My first experience with Elecrow was pretty horrible because of how long it took for me to get my boards back.  I placed my order and didn't get any response back for quite a few days. Then the Chinese new year happened so I had to wait another week, but finally my design went to the fab, it took a very long time to get back from the fab, and then it took like 4 or 5 weeks for me to receive my order. All told it took like 2 and a half months to receive my boards.
zapta:
OshStencils over two stencil thicknesses, 3mil and 5mil. I used the 5mil because it prints more paste.

The trick not to smear too much is to have only one slow pass. If the first pass didn't go well, don't do a second one, clean the board and redo.

From my experience, metal stencils such as the ones from electrow are more accurate and better for small pads (0402, QFN, etc). It also helps to have fine paste, e.g. T5 rather than T3.


calexanian:
proper hinging of the stencil is critical to prevent smearing. I use masking tape. also as said above, using another piece of PCB of the same thickness to border the subject board is essential. a flat surface, masking tape, and scrap PCB cuts actually can make an effective little setup. I do it here for sample batches and flow the boards in a convection toaster oven. Very handy.
zapta:
Apropos brackets, if you have access to 3D printer, you can print brackets with customized thickness and size.

http://www.thingiverse.com/thing:530949
Kasper:
I recently got access to a 45W CO2 laser so now I want to make my own stencils. It can't cut metal but mylar should work.  I've had good results with 3 mil mylar stencils made by polulu.

I usually make small boards < 3 sq in.   I was searching for 3 mil mylar but this 4 mil mylar is what came up on amazon.

Does this look like the right stuff?

Does anyone recommend anything else?

https://www.amazon.ca/mil-Blank-Mylar-10-5-sheet/dp/B00RDATMOU/ref=mp_s_a_1_fkmr0_1?keywords=3+mil+mylar+sheets&qid=1550594283&s=gateway&sr=8-1-fkmr0
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