This is a custom base plate for an extended CZ Shadow 2 magazine. This baseplate can be used with picatinny rail attachments. My case was to attach Mantis, so it can be used together with a holster. 

Print it vertically with support (back side on the table). This is to make fiber perpendicularly to the force of the spring. I used ABS with 240 nozzle and 100 bed temperatures.
Please note that this might not work with regular magazine because of different spring length.  Your original baseplate should have written “Plus 2” on the side.