You do not need a printer if only doing a few one off's, I have used various services to print models. Not an endorsement, upload file to print and then see various vendors willing to print along with cost. www.treatstock.com/
Using PLA material is good enough if scope not going to be out in the sun for extended periods of time, going PETG if it is.
I never had a cooling problem that I was aware of/encountered. Since the fan is really only offset by a fraction of an inch, it still has vents it can exhaust air through covering the entire fan surface. Also, the offset is so small that the fan still covers all the heat sinks/chips on the RPi board. The fan isn't really mounted 'sideways' but rather just moved a fraction of an inch diagonally from it's 'normal' position.
Best of luck,
Celestron EdgeHD 11/Moonlite LiteCrawler/iOptron CEM120EC2/ASI6200MM Pro
Radian 61/Radian Focuser/iOptron CEM26EC/ASI6200MC Pro
OAG: ZWO OAG-L/ASI174MM or ASI290MM
ZWO EFW (7x2")
PegasusAstro Ultimate Powerbox V2
Raspberry Pi 4, 8GB/StellarmateOS
Be advised, if you (or anyone) decides to get a printer, the number of things I found to print/fix keep growing.
Len's caps for finders, knob for RedDot, side bracket (broke and glue was no use for original) for RedDot, ESP32 cases for DSC control, DSC gears/adapters, 2inch to T-2 adapter, plus a multitude of adapters/gadgets for around the house and car.