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I re-sampled the original cowl so it would match and fit the original on the E-Flite 1.5m Texan. I added a support ring so the radial engine will fit nicely and allow you to glue it in place. In comparison to the original it adds very little extra weight. Print your parts separately. There are no screw holes in either. That's for you to work out or as in the case of a buddy he used magnets to secure it to the fuse.
My apologies for not being able to link to the original motor which I have reworked as well. I found that when I first started and didn't know about tracking a file here. Kudos to the maker though.
Print the cowl facing upward and use “ support on build plate only ”. Yes it is a long print but I couldn't find a replacement anywhere so it was my only option. It fits like a glove so once done you should be happy with it.
EDIT: 12/23/22
EDIT: 3/14/22 I designed an exhaust pipe for the plane. You can find it here… https://www.prusaprinters.org/prints/150589-eflite-15m-at-6-texan-exhaust
For some reason I'm not able to link the original cowl design while uploading so it can be found here… https://www.thingiverse.com/thing:2829345
The author marked this model as their own original creation.