I have a lot of Reaper bones and need more bases. I don't want to pay for the 25mm chamfered edge bases so I made my own.

Two recommendations:

1. print a test base and adjust your x and y settings to get the base to 25mm. Mine came out at 24.8mm the first time I printed.
2. Print the small side down. There isn't enough overhang to need supports. Printing with the small side down means you end up with a smooth top surface for basing your mini.