I have an old set of Lego trains with a 12V train motor.
https://www.bricklink.com/v2/catalog/catalogitem.page?S=722-2#T=S&O={%22iconly%22:0}
There was rubber rings on the wheels to make good contact and friction but it is not a surprise that after 50 years the rubber rings broke. So I measured and designed new wheel rubbers that can be printed with flexible material and with them you can restore your old Lego train engine!
I attached some photos about the disassembly and cleaning just for fun.
Print with TPU, the softer the better.
I spend countless hours perfecting and testing my designs and I would love to hear your feedback too. If you like my designs I appreaciate a like or a comment. Please post a photo if you print this.
I am open to any kind of donation if you want to support me :)
https://paypal.me/andrasbognar
The author marked this model as their own original creation.