I found a few tutorials on doing this in Fusion 360, but none in FreeCAD, so here you go. As mentioned in the video, I'm calling it the Prusa Trick since it came to the attention of the 3D printing community through the STL files Prusa provides for their printers. As mentioned in the two videos linked here. Angus at Makers Muse https://youtu.be/IVtqAn4oDDE?si=JgIpHvUiTvoxs84O Adam at Vector 3D https://youtu.be/IVtqAn4oDDE?si=JgIpHvUiTvoxs84O If you like my videos, please subscribe here: http://www.youtube.com/user/loughkb?sub_confirmation=1 If you want me to keep making more videos like this, consider becoming my patron at Patreon: http://www.patreon.com/kb9rlw/ Discuss this and other videos on Facebook: https://www.facebook.com/kb9rlw/ If you want to give me a tip, patreon donate page is here: https://www.paypal.com/donate/?hosted_button_id=TJDA65P3JDVHJ