Duplo Train Car

My 4-year-old grandson requested I make a train car to look like one of his other toy train cars. I designed this for him to add to his Duplo train collection. The model includes the trailer with wheels and rotating hitch. The Car top can be used with the printed trailer or is completely compatible with the Duplo Train trailers. Also, my trailer is completely compatible with Duplo's tops. The trailer is made of 4 different parts; wheels, trailer base, trailer top and rotating connector block. The wheels are printed and pressed into the trailer base. The connector block is added to the trailer top and both connected to the assembled trailer base. I printed all parts in PLA with the wheels in grey, the connector block and Car Body in yellow and the remaining parts in black. I printed all but the wheels with 5 wall loops. This keeps the Duplo nipples and connector post strong. I and others have had them break off when printing with 2 wall loops. These models do not require the use of