I wanted to do some Unicron Slave/Envoy type kits around the Titans Return headmaster figures. My first attempt (Chromedome) didn't have the eye holes come out (maybe saying close all holes in Cura did that), but then I revised the helmet anyway to try to allow it to fit Twinferno.

I suggest rotating the head so that the back flat is on the bed. Also understand that I made the handles for the sword and sia to be 4.8 mm in diameter (variances in 3D printers may cause that to be too loose for the 5 mm hand holes). The FreeCAD files are included should you decide you would like to modify these.

Monoprice Mini

Yes

Yes

0.2 mm

25%

Rotate the head so it is with the flat back with the hole notch facing the bed and the eyes are facing up.