N Scale / HO Scale Bus Roof Air Conditioner  by Skowalcyk on Thingiverse: https://www.thingiverse.com/thing:6669838

Summary:
Needed roof top mounted A/C for my N scale tour buses so I made this up real quick in Tinkercad.  Might work good on vans, trucks, ambulances, food trucks, ect.  Needs to be scaled down.  I found 20% to 22% scaled down worked good on N scale depending on the bus. For HO, you'll probably be in the 40% to 50% range but you'll have to find a size that works for you.  Printed at 22% on my Anycubic M3 resin printer and it only took about 10 mins.Please share a photo if you do end up using this on your own project.For Personal Use Only!  NO SELLING on eBay, Etsy, Ect...  I check those sites regularly. 