Mini Holdfast for 20mm holes "Festool"

thingiverse

This mini holdfast is surprisingly strong "I have not broken one yet". You will need to print it (FDM) laying flat so the grain adds the strength. I have imbedded structures inside the part for extra strength.Add some rubber or leather on the contact face to eliminate damaging your project and to minimise movement. Hit the holdfast on top to secure in place when done hit it on the back to release.