40mm to 50mm Fan Adaptor for 50 mm Heavy Duty Layer Fan duct - FLASHFORGE Creator X (MakerBot Replicator Dual, CTC and more)

I have loads of 40mm fans, and decided to make an adaptor for this design, as i like the design but i had no 50mm fans. i guess it would work for other designs, where a 40mm fan is to be fitted in a 50mm fan hole.

its tight enough for no need of screws to fit, compression fit.