Unable to craft Firey bow string?

[Atomisk]

Someone told me the best possible bow was a pair of slime rods and a firey bow string. I have the flame string from the heatscar spiders here, but I can't seem to be able to use the part maker to create a fiery bow string. I can make a regular bow string just fine, though. What am I doing wrong?

[ChaosFisher]

you cant make flamestring bowstring heatscar spiders are from a different mod you can use a lava crystal i think to give it flame