Hey buddy. You know I tried Teespring one time a couple years ago. I picked a poor quality shirt a hanes shirt so not sure if this is a fair assessment but I was very disapointed in the quality. They do offer other brands which are better but my other issue was print quality as well. With my shirt they clearly folded it prior to the ink drying and it caused the shirt to stick to itself and smudge ink. Maybe that was a one off bad experience but it left a bad taste in my mouth.

I've used Printful and use Redbubble, I enjoy both those services. Printful is great but for a Bella Canva tee with shipping your looking at an $18 base price which is pretty steep even if you sell a shirt for $25 which is pretty high for a tee your only making $7 profit

Not sure if your looking at making tees for your shop or just to make novelty tees but if for your shop you could probably use a local screenprinter, initial setup will cost some money but in the long run you should save quite a bit with the better margins.

Feel free to hit me up when you get started if you have any questions