Model Rocket Engine Mount w/ Retainer

This Engine Mount is to be glued into a body tube with inner diameter of 41 to 43.5mm. It holds a standard Estes A, B, or C size engine. The cap screws on to hold it in place. You put the igniter in after you screw on the cap.

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Don't use “silk” PLA. The threads don't come out as well.

The threads and cap are from Arogen67 at Printables.com. The file name is “Motor Retainers BT-20 and BT-50 Estes compatible.” Thank you! I did modify them to allow one to screw the cap down as far as it would go, instead of hitting a stop.

The threading of the cap and mount can be rough, but after forcibly rotating them the first time, they screw together fine.


I tested a print of this engine mount to see if the PLA would melt of get soft. I used a B6-4 engine. The printed engine mount did just fine -- no signs of softening. I attribute this to how short a time that engine is hot.

It's hollow, with ribs inside. This design makes it lighter that a solid would be.