So I found a rotational casting machine here on thingiverse that seemed easy enough. Here is the link to it: https://www.thingiverse.com/thing:1473325. The main problem I ran into was that the only real instructions were that "assembly should be self explanatory." This was not the case. Assembly really was not self explanatory. Over the period of a month I have been working on getting the machine built, and I have ran into many snags. Issues with piece not going together well, to issues with the belt not being tight enough or slipping a great deal. I have made a few alterations to the design so it should work fairly well now.
Endcap2 is for if you want to cap off the PVC pipes. They aren't mandatory, bt they look nice one.
I have linked my instructable.com directions here: https://www.instructables.com/id/Rotational-Casting-Machine/
It will list all the tools I used as well as all the other supplies needed.
I did supports on the pulleys. And the 50% infill increases the strength of you parts to where they need to be.
I used brims that were at least 0.08mm instead of rafts, with 1.75 mm PLA and a bed heated to 30 C.
The rotational casting machine without belts added.