A mini V8 the size of a Benchy, easy to print and fun to assemble (and less fun to post-process...), in the form of a Flat-Pack.
This model requires post-processing for the parts to fit together properly

Recommended print settings:
-layer height 0.2
-line width 0.4

The model is 4cm long (motor block without axe), it's very small, The printing took a little more than 2 hours.
You can scale it up to 1.5 (according to my slicer a little more than 5 hours of printing) for easier post-processing