works really well but leave it to cool first

works well but if the marble is too fast it will tip

I used the gravitrax vertibinder you can print to make a cool track

I printed 10 and they are so good they are hard to take off

so small I lost it!

so good I blew it so hard it jumped out and broke. still a great model

small, but powerful

works really well and looks so cool

all the peices fit together well and is really cool and detailed

really cool but I used Polly cement from an airfix kit to stick it together