EDIT: I've printed and assembled this and it fits the plane as expected (see horrible photos). The firewall may be a little large for the mount, but that is intentional so that you can cut/sand it smaller or leave it large if needed depending on your printer tolerances.
The northern Pike is an awesome looking 3D printed R/C plane, but I don't like the idea of motors mounted directly into plastic not matter the material. I created this alternative motor mount to allow the use of a wooden firewall cut from hobby ply in conjunction wit hthe standard cross-style aluminum motor mounts. This should handle a hot motor much better than ABS or PETG, while still retaining the style of the original motor mount and the abaility to easily swap out the motor.
any Any material will do fine, though PETG would last longer than PLA
Print the motor mount with the flat side down.
You can use the included DXF as a guide for cutting the motor mount, or if you have access to a CNC/Laser cutter. Alternatively you can print out the firewall and trace it onto a piece of hobby ply and cut by hand.
The firewall is glued into the motor mount, and the motor mount is glued onto the plane body instead of the standard motor mount.