I cut the main cyclotron (cutout version) into four parts from PakRatJR's proton pack for printing on my Ender 3's bed. You'll need to print out PakRatJR's cover to go with this (GB_Cyclotron_cutout.STL). Each of these has peg holes and pegs to align the four parts together to help glue them together.
You'll want to print out one CyclotronPart1.stl, one CyclotronPart2.stl, and two of CyclotronPart3_4.stl
I printed these with supports, which will help make sure the pegs and peg holes all print out more precisely.
I'm including my print settings, and they worked well for me, but I'm sure good prints of this part can be achieved with different settings from these.