2.2" x 4.19" ZigZag Foams for RC Crawling (Ultra Stretched 1.9")

Just to make things clear, my designs are protected by copyright laws. It is not authorized to distribute or sell any of my designs without prior written authorization from myself. Even if you modified my original design. Thank you.

This is a tire insert model to print in TPU for 2.2" wheel with 1.9" tires with 4.19" diameter or Class 1 (stretching the 1.9 tires to 2.2) for RC Crawlers/U4RC/Scale rigs. There are three models included to cover the different brands available. This model is enhanced to not require support when printing and optimized for 0.4mm nozzle.

The model has 3 layers that provide progressive resistance to the tire surface, from very soft to stiff in the center. This allows RC cars to have great traction while keeping the tire shape, adding grip, and making the car predictable during crawling, trailing, or racing.

Check the video explanation with assembly here: https://youtu.be/grk4mYsLeGY

Read 3D printing settings carefully, as is critical to get the right outcome. Each print will take ~3hrs if set up correctly. If you need help, please reach out on my Facebook page: https://www.facebook.com/groups/d440rc

You can sell 3D printed parts designed by D440RC, but need to comply with four simple rules: 1) Respect the brand, make it clear this is D440RC design, and don’t change the original name/brand helping advertise model purchase in Cults, 2) you need to buy/download the models you want to sell, 3) prints must be in good quality, 4) you can only sell 3d printed parts, you CAN NOT sell/give away the models/files, those are only for you to keep.

The model uses Ultimaker Cura slicer infill patterns to model the soft layers, providing full flexibility to the user to configure the tire insert as they like. The model will include 3mf file to open as "project" in Cura, which includes the print settings.

After several testing, the best infill in my experience for RC Crawling/Trailing use cases is Gyroid with 6% Infill. Infill UP or DOWN if you want softer or stiffer insert. Between 5 and 10% I found to be good, but 6% was the magic number for me but depends a lot on the filament you are using.

This must be printed in TPU (tested with Overture TPU 95A), 0.4 or 0.3mm nozzle, wall line count 1, and 0.2~0.28 layer height. Make sure your TPU settings are performing well. Printing Gyroid usually needs good cooling and slow speed (I do 20mm/s for infill and 100% cooling fan - but this will depend on your printer capabilities).

Here's a video with some tips to get the desired outcome: https://www.youtube.com/watch?v=7GkwF7k0koY