Review on ROKR Assembly Mechanical Christmas Valentines: Perfect DIY Gift to Celebrate the Festive Season! by Erik Haynes

Great fun, good challenge, but poorly working design. Marble explorer doesn't gain enough speed to reach the firing point. Being a very mechanical person cannot help overcome bad design. So you spend hours (about 30) on a flawless assembly of parts and end up with a cool gadget. then it doesn't work. This is very disappointing in the end. I would like to add that I was able to change the design and it works fine. However, I see that many people give up at some point. I took a two week break and decided to make it work. Here, just a few simple design changes with no difference in cost make this item really impressive. Call me for a Rokr solution.