Hello, heres a collection of crochet bases for you to print. I have created a few to start and can create more variants if there are some you would like. 
The file names have the sizes as the names. So 200x180-9 is a base that is 200m by 180mm with a 9mm diameter hole. They are all 2.5mm thick.

I used the 210mmx270mm base to create a basket. I used a 7mm hook to start and then a 10mm hook for the rest of the basket. I was using a t-shirt yarn. I am still new to crocheting so let me know if you have some suggestions!

Thanks!