Update 27/01/2024:

My last set of models for a while - some straight stackable ramps:

https://makerworld.com/en/models/158553

These can be printed instead of the original ‘curved’ ramps if you want your ramps to stack

Update 26/01/2024:

After extensive play testing, my son dropped a few suggestions into the suggestion box for me. I've added some new parts to the ‘starter pack’.

1. A ‘bumpy road’ piece which either sits on the ground, or across two support pieces. This is now found on plate 8.
2. A ‘pin’ (m) version of the straight stackable ramp. The original only had a socket. Plate 6 used to have two ramps with sockets, now it has one with a pin and one with a socket
3. A ‘joiner’ piece which is only 10mm high but is stackable. This piece can be used to put other blocks at a custom height, or to help lock everything in place for kids who want a ‘gap’ to jump but don't want the ramps sliding around. I've put two on plate 9.

Check out the last few photos for examples.

Update 16/01/2024: New parts available:

Crushed Cars - https://makerworld.com/en/models/141716

Shipping Container Backflip Ramp - https://makerworld.com/en/models/141874

Oil Drums to Smash - https://makerworld.com/en/models/141931

These are on their own pages so I can attribute models I've ‘remixed’ correctly.

Your little one (or you, I won't judge) can now build their own Hot Wheels Monster Truck Stadium!

Simple model but a lot of fun for little hands. The pieces interlock loosely and in may combinations for hours of fun!

I printed in PLA

3 layers top bottom and side

15% Rectilinear infill (it seems to give a nice smooth finish on the ramps)

The square support with holes can be printed with lightning infill to save a lot of time and filament, as the through holes give the top plenty of support, but I recommend at least 4 bottom layers if you choose to do this.