Due to incompetence on my part, I have incorrectly designed and printed two adaptor pipes for my new Dust Commander.
These are
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A right angled 90 bend with a 50mm diameter pipe on one end and a 40mm diameter pipe on the other.
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A straight pipe with a 50mm diameter pipe at one end and a 40mm diameter pipe on the other .
Tube thickness is 2mm and printed at 20% in black. I can assure you that it fits the Dust Commander very well, doesn’t fit my 32mm internal (40mm external) diameter pipe at all. Can you see where it went wrong 
?
These took 10 hours to print and might be useful to somebody (not me though). They are free to anybody who wants them. I’ll cover postage in the UK but will ask you for a small donation of your choice to the North West Air Ambulance.
Rob