Engine - 4 Cylinder Inline

4 Cylinder IC engine based on Inline/Straight configuration

In order to Assemble it after 3d printing you need following items
1. M5 X 30 mm - 6
2. M2 X 20 mm - 8
3. M2 X 45 mm - 4

I also made a Youtube tutorial showing the process of design in Solidworks

Link: