Carrera Structo Jeep Renegade Tyre

This R/C car is about 34 years old, the tyres on mine (which I've had that long!) are cracking and falling to bits. This is a replacement tyre for the model. This one is printed in Polyflex which is possibly a bit on the solid side for tyres. We've not dialled in the Ultimaker 2+ on Ninjaflex yet which would probably be a better as it's softer on the durometer scale.

You need to use a screw driver to help get these on the rims, they are harder than the stock tyres. If you have the time/patients I would try this with Ninjaflex.

Print Settings

Printer Brand:

Ultimaker

Printer:

Ultimaker 2

Rafts:

No

Supports:

Yes

Resolution:

0.4mm

Infill:

30%

Notes:

Polyflex - Flex.

Hot end: 230C

Bed 40C

Layer Height 0.1mm

P/S 41.7

Retraction Speed 40mm/s

Retraction Distance 4.5mm

Print Surface: Glass

Slicer: Simplify3D

How I Designed This

Built in 123D

This is built in Autodesk 123D, a very powerful (if a little unstable) tool.

Outline of tyre drawn as a sketch

Lathed through 360 degrees (keep the centre point handy - this is now a slick tyre.

To add a nice smooth circular tread pattern around the tyre:

Make a rectangle the size of the tread depth

Lathe the rectangle through 24 degrees

Draw the thread pattern as a single item

Extrude the tread pattern bigger that rectangle created earlier

Rotate the thread pattern to the right angle

Repeat the tread pattern 5 times (the outer two will only have the very edges cut into the tyre)

Subtract the tread pattern from the rectangle.

Repeat the tread pattern 15 times around the centre point of the tyre - (24*15 = 360 degrees)

Align the 15 tread pattern templates with the centre of the tyre

Subtract the tread 15 patterns from the tyre.

Outline

Slick

Tread stencil

All parts