FreeLego Duplo Compatible Hexagon Train Track Crossing
Thingiverse
9 model
Free
FreeTrain X Crossing Compatible with Wide Wheel Lego Duplo Trains
Thingiverse
Freesnoopy duplo compatible
Thingiverse
FreeSnowgie - Frozen Baby / Olaf Snowman (Duplo compatible)
Thingiverse
FreeLego Duplo Compatible Train Track Crossing 90
Thingiverse
FreeToniebox figure mount - duplo compatible
Printables
FreeNFC-Tags with Duplo compatible nubs 2x2 3x2 and 4x2 for a Toniebox/Phoniebox
Thingiverse
FreeDuplo compatible plate 12x12
Thingiverse
FreeBrickorama
Printables