Fully printable - no support - no glue - single color 3D printer
This is a semi truck toy with a dump truck trailer.
Assembly video (semi truck) https://youtu.be/TJCMTOk385AAssembly video (tank trailer) https://youtu.be/-EAHEBORbbY
The semi truck is more or less the same as the one with the tank trailer:https://www.cgtrader.com/3d-print-models/games-toys/toys/semi-truck-toy-fully-3d-printable-assembly-experience
For the dump trailer print as many middle modules as you wantto get the tank length that you want. You will need however to printthe longer dump_semi_connector_L.stl and more connectors and screws for this!
You can also make a short version with the pieces from this model (see 3rd to 5th pics).
The tolerance for pieces that need to fit tightly is 0.1mm,for pieces that need to allow movement (like screws and axles) 0.3mm or more.
Printing list: Nb. STL file name rezolution support colour (my make)
Observations: