An ER40 collet wrench/spanner. Useful in a pinch in place of a proper metal one for tightening ER40 collet chucks, tool holders, collet blocks, etc. Printed in PETG this wrench has enough strength and a long enough lever arm to provide enough clamping for most applications.

Since 3D printers and materials vary some tuning (scaling) may be required to get a good fit on the collet nut.