Mini-B Rear Slick Tire - Simplified Mold

Cast your own rubber tires without the need for expensive equipment using this 3D printed mold.

The tires created by this mold are designed to fit a Mini-B rear wheel.

Resin Casting Tutorial Playlist

Includes step by step instructions for making tires using this mold https://www.youtube.com/playlist?list=PLyysFycibsx2_bjo1-r2uoug9edZcFnTx

Related Prints

Printable Mini-B Rear wheel: https://www.thingiverse.com/thing:4965339

Resin Syringe: https://www.thingiverse.com/thing:5241082

Mini-B Tire Foam Insert Cutter: https://www.thingiverse.com/thing:5241546

Required Hardware

M5x45 bolts x 4 (these can be longer if you already have hardware sitting around you could use)

M5 nuts x 4

Danco #77 O-Ring x 2 (1-1/4 in. OD x 1-1/16 in. ID x 3/32 in. wall)

The O-Ring was found at my local Ace hardware store. I have included its dimensions incase you need to source it elsewhere.

Suggested Resins

I have had the best results using resins with longer pot life times. Something in the range of 15 to 30 minutes will give you plenty of time to mix, degas, and inject the resin before it starts to set.

40A urethane rubber has a feel fairly similar to outdoor soft tire compounds such as JConcepts green and Proline M3. I do not recommend 40A tires for running on carpet - they are too soft and the tread will be worn down in a matter of minutes.

60A urethane rubber has a much firmer feel and is a great choice if you plan to use the tires on carpet as it provides excellent tread life. I'd compare it to Schumacher's Yellow compound.

Also, you will need a mold release. I have been using Stoner Urethane Mold Release E236. I have found one application is enough for multiple pulls.

Required Tools

Resin Syringe (printable)