I too have bought these to try Bought them at the end of November for 2017 /2018 season thought Mojo would have worked out all the bugs on these but mine 2 of them have stopped working and one is making a squeaking noise I have tried to email 2 times to customer service and still no response I like the idea and I believe in there Product wish they would fix these bugsNote: If your power transformer has a center tap for the green heater wires and you replace it with a non center tapped power transformer, You will have to add two 1/2 watt 100 ohm resistors to the heater circuit to make an artificial center tap.Will be right back... Thank you for your patience. Our engineers are working quickly to resolve the issue. Yahoo. Will be right back... Thank you for your patience. Our engineers Scooter Wreckers have a wide range scooter spares, scooter parts for most scooters... Our F123 Series is the world's most reliable range of industrial-grade 3D printers. Designed for the way you work, they are built on 30 years of research and development by a team of engineers, designers, educators and manufacturers.Yeti Cycles is a high-end mountain bike manufacturer. We are Ride Driven.