A replacement frame for a Bachmann QJ locomotive. I've had this printed in SLS nylon

Caveats: The design could use some tweaking, there is some cogging when under heavy load. Pilot mounting could also use some tweaking. Was made with an old version of FreeCAD and needs some work before editing in a new version of FreeCAD. I don't know when or if I'll be able to clean up all issues.