NEMA 17 Stepper Motor Mount for Polargraph

I'm trying to make polargraph (wall plotter).
Looking for stuffs need to build it. And check everyday here thingiverse for parts to print.
I found some parts of MTvplot by Michi_Teck ( https://www.thingiverse.com/thing:2371117 ). But I thought it need mounting hole.

*** modified 2018-10-24 **
I just added motor_mount_spacer becuase most of stepper motor's shaft length about 25mm (My motor's one is under 20mm)

If your motor shaft length was longer than 20mm, download motor_mount_spacer