Chris,
My car isn’t running yet so I don’t have any empirical data. That said, I’ve been careful to keep the 3D-print parts away from heat sources and critical areas. I also upgraded my first printer to a Mark Forged because its proprietary Onyx material is stronger, stiffer and more heat tolerant than most Fused Deposition Modeling (FDM) materials. Onyx is nylon with chopped carbon fiber strands. As you can see in the chart below nylon, has a higher melting point than most commonly used FDM materials. My printer’s extruder operates at 270° C (518° F).
More relevant is that Onyx has a relatively high heat deflection temperature (HDF) of 145° C (293° F) as shown below:
My printer also allows me to lay continuous strands of fiberglass, HSHT fiberglass, Kevlar or carbon fiber in the X-Y axis. I previously discussed this in
post #100. The following descriptions are from Mark Forged’s website which will give you an idea of when the different types of continuous strands might be used.
Fiberglass is 4x stronger and 11x stiffer than ABS.
HSHT fiberglass has the highest impact resistance and heat deflection temperature of our continuous fibers, and is great for applications that require high heat and impact resistance.
Kevlar® is tough, lightweight, and can bend further than other fibers. It is best used for applications such as soft jaws or end effectors.
Carbon Fiber is the strongest of the materials, and has the highest strength-to-weight ratio. It’s strong enough to replace aluminum, but weighs less than standard aluminum. Carbon fiber is often used in robotic components, forming tools, inspection fixtures, and end use parts.
All of the brackets that support the coolant and heater hard lines have insulation on them. With respect to the most recent bracket:
- The pump is small
- The pump has a brushless motor so it shouldn’t get too hot
- Intercooler coolant has a lower temp than engine coolant
- The bracket is mounted at the bottom of the car so rising heat isn’t an issue
- the bottom of the car will have removeable panels so there won’t be impacts other than me dropping a wrench on it
- there will be an aluminum heat shield 4” from the exhaust manifold and the bracket is 10” from that
It should be OK, but time will tell!