Spritz cookies not sticking to pan when pressed from cookie press

As I understand your question, the problem is really that you can't get it out of the cookie press, and not an issue of the dough "flattening" once it hits the baking sheet. If that's correct, then there are a few different factors that could be contributing:

1. You might not be using a strong enough flour. I've always used a 1:1 mix of bread flour and pastry flour. All-purpose flour isn't great for spritz cookies and many home baking recipes do odd things to try to strengthen the dough to compensate, such as increasing the quantity of egg. Not much more I can say without knowing the specific recipe, but try to find a recipe that doesn't use AP flour.

2. You might not be using enough flour, or you might have added too much water or milk. The dough should feel relatively firm once it's well-blended, not soggy or watery. The preparation I use also contains a good quantity of icing sugar, which has its own starch; if you're using regular granulated sugar instead then that will be a contributing factor to sogginess/stickiness. Also don't forget to sift the flour.

3. Home baking recipes often make wild guesses as to the quantity of eggs, based on assumptions about the size and age of eggs you'll have. The ratio I use is 20:13:8:6:3 (flour:fat:sugar:eggs:milk/water), by weight obviously. If you use too much egg then you'll end up with a slimy texture that's hard to separate while raw.

4. You may have added the eggs all at once, which makes it difficult to incorporate without overmixing the dough (or not incorporating well enough, which again will give you that slimy texture). Make sure you're only adding one at a time.

5. If your recipe calls for oil as a fat, or you're substituting oil for something else, that could be a problem. Typically you'll want to use a mixture of about half shortening and half butter. You don't necessarily have to use shortening, but butter has a low melting point and melting will, again, cause your dough to become too wet.

6. Did you cream the fat(s) together with the sugar? That's another important step to getting the right consistency of dough. You should have a mixture that's light and fluffy before you add the flour, eggs, or milk.

7. Make sure you're adding the flour last, otherwise you risk overmixing.

As far as sticking to the baking pan itself is concerned, just line it with parchment paper and don't grease it. If you've made the dough properly then it will "set" and not sink.

FWIW, I also find it easier to pipe spritz cookies than to use a cookie press.

Chill the cookie sheets in between batches. Stick them in the freezer or outside (depending on the outdoor temperature). I was having the same problem and this was my mother's solution.

maybe you need to chill the cookies, they might be too liquidy from the room temperature

I just discovered that the disc in my press was in upside down. It had nothing to do with the temperature of the dough or the pan. Now it is working perfectly. So check your disc if your Spritz dough is not sticking to your pan.

You must use cooled off cookie sheets so the cookies will stick to pan and come out of the press with no problem. Cookie sheets can not be warm. That is the answer.

Place the cookie sheets in the fridge before using. Also wash the cookie sheets after each use to remove butter and then place in the fridge. I've also noticed, if I press the cookie press and then lift up from the cookie sheet real quick, it seems to help too.

I just made 9 dozen tonight, tinted the dough pastel colors and dipped cooled cookies in melted white chocolate and sprinkled w different colors of sanding sugar. No Probs! The last time I made them I had a HOLY MESS!! Dough wouldn't come out of wilton press, (I had chilled the dough. Make it, then use it) and then wouldn't stick to the pans. Do not spray or grease the pan, don't use hot pans, don't use nonstick pans or line them w parchment or pan liners! My dough is nothing special. I follow the Wilton Recipe that is on the Wilton website, under recipe tab. And I mean no problem!