Summary This is a rear mounted fan for the Duplicator i3. it uses a 50mm fan. I could not find a fan that provided good clearance for the glass clips and also the bed cable. I made my one. The beauty of it is that it does not require any support. I have printed in PLA and PETg at .2 resolution with no issues. I added 2 blower adapters for a 50mm x15mm. One is for single and the other is double.