[Johnno]

Having had a look on Shapeways Olifer chassis are around £12 to £15 and other makers are anything up to £22 so by the time you have added Shapeways shipping cost £20 for a good quality 3D chassis isn't so bad. 

 They look like a good idea but I do baulk a bit at the price. £85 for the complete kit makes them a fair bit dearer than Slotit and NSR rtr cars.
  A 22K motor would be way too slow for our modified GT class and I suspect other racers would prefer to use a different motor so the body and chassis option will probably be the most popular.

I looked into this as a host class (RTR £125.00) and at that price for four including currency conversion is $950 Australian, that makes each car $224.95 AUD.... OUCH!!! four will be just shy of $900 plus freight


I will consider these though for this price I expect them to be Race ready out of the box, wheels and tyres trued, motor oiled and greased, gearing oiled and greased, no rattle or vibration throughout the chassis or body, decent racing tyres, decent crown and pinion including decent teeth on each for speed, wood guide the complete kit and kaboodle... 

I've been caught once paying $215 AUD for one car that was an absolute dog, still runs a little noisy and I am sure most people will shy away from these very expensive cars until certain guarantees can be given.

   
Ref# PSR-3D-CT04 - RevoSlot Toyota Supra No.39 & PSR 3D Chassis

Recently I've bought four Revo metal chassis cars for a new class in our group racing and out of the box the Dodge Viper has so far been the absolute best, requiring only front and rear tyre truing.

One other required front and rear tyre truing, chassis isolation (using Gorilla Tape) and adjustment of the motor, the others required motor adjustment and front and rear tyre truing. All fairly easy to do and at a reasonable cost.

As mentioned for $225 AUD I'd be expecting and demanding these are perfect out of the box.