I've been using a modified universal nylon holster for daily carry for over a year. It has worked well for me, because I've been able to use it with all of my compact carry guns, and it has been really comfortable. However, with all the dry fire practice that I do with my carry guns, it has started to wear out. When new, it was also stiff enough that it wouldn't collapse after the gun was drawn, which is great for re-holstering frequently during dry fire sessions, but it hasn't maintained that stiffness over time. I have been considering using custom Kydex holsters, but I didn't want to buy a separate holster for every carry gun that I own due to the expense. I also wasn't completely happy with the design of most of the commercially available holsters, so I decided to just build my own molding press and buy the materials to make my own custom holsters. After taking the time to build my press and make my first holster, I can tell you that the average price of $70 for a quality Kydex holster is a bargain! :-P But, the satisfaction of making your own custom holsters is priceless. ;-) By the way... I have no intention of making and selling holsters. I just wanted to make them for myself.
The first holster I made was for my CZ P-07. As a bonus, this same holster works nicely for my CZ 75 P-01 by simply tightening the tension screw near the trigger guard. To make this task easier, I used a stainless steel thumb screw, which also helps to secure the holster in place when worn.
The second holster was for my two CCO sized Sig Sauer 1911s. Even though the slide profile is different on the two guns, adjusting the tension of the trigger guard screw allows this one holster to work for both guns.