I found this file on thingiverse maker name is “docdix” i could not find this file on maker world so i decided to post it on here if you have time please go support him on thingiverse 

p.s. docdix if you would like to post this on here and want me to remove this print profile then i will gladly do it just posted it to get other able to print it

the bearings used should be a 5/8 inch roller ball transfer bearings 

for more information please go to the original creators page