Retractable RC plane bungee hook - print in place

thingiverse

This is a retractable hook for planes of about 1.5m span who land on their belly without retracts. This is to enable bungee launch. The hook prints in place with a print quality below 0.2mm. I got strong and fine prints with a 0.16mm height print. Please note that on the picture the hook is damaged on the end. I fixed the design after this fail. However the quality of your first layer needs to be good enough to hold the small extremity of the hook before it joins the rest of the part. This is to create a small hole to help releasing the hook on the flying field. I advise to use spray glue to increase adherence when printing if needed. For a more simple hook please see this one: https://www.thingiverse.com/thing:3737792