an update to my version 1 https://www.thingiverse.com/thing:7101257

This version needs an additional 4 x M3x35mm bolts and 188mm GT2 belt in addition to the original parts:

• Nema 17 Stepper Motor Bipolar 4-Lead
• 1 - 5/16-18 x 1-1/2 bolt
• 1 - 304 Lock Nuts, M5-0.8 Nylon Insert Hex Lock Nuts
• 2 - 608 Bearings (or print included STL).

This model uses a 1:2 ratio instead of 1:5 ...make sure you update your settings.