Hi there, thanks for the feedback. I will certainly look into the suggestion about the steering mechanism. Splitting TPU wheels would have been good but I think it should be a decision taken by the maker in accordance with their filament and machines. Most of the makers use PLA and so I have tried to provide that in the print profile. Regarding the tolerance issue that you have pointed out. I think the readme might have caused some small misunderstandings. The warning provided in the read me refers to some parts which are expected to have zero tolerances such as pins between two joints. The logic for this recommendation is also given in the warning which is to ensure that there is a friction lock in the joints enabling the parts to be oriented in specific positions without any external parts. To explain more consider the boom of a truck. It has tilt mechanism which is achieved by a pin joint at the base of the first boom hand. If this pin is able to lock the arm in any position due to friction, it would be ideal than the pin lock provided. For such a friction locking to be achieved between parts, there needs to be almost zero tolerances between the parts. It's just a advisory statement. Moreover I have tried to make this clear in the print profile readme also that I have taken care of everything. You as a maker is expected only to print and assemble. I have also tried to refine the model with feedbacks from makers. In some case you may have to scale some small parts according to your printer tolerances and filament quality. I am sure you are aware of this general rule. I hope I was able to settle the issues you have pointe out. Please do let me know if you have any further feedbacks. I try to reply at the earliest. I wish that you would certainly try my model now.