This is a simple 2x2 Duplo to 1x1 Mega Bloks adapter.
Fit is very snug, and sized so more can be placed together as needed (see last picture).
(Boat used in pictures is thing #200953)
Support:
Not needed if your printer can handle bridging.
Rafts:
No
Supports:
No
Resolution:
0.2
Filament:
eSun PLA+ Pink
The author marked this model as their own original creation. Imported from Thingiverse.