Very good design ! Fast to print and sufficiently strong with magnet 🤗 (The fit of the bit is tight and good, too see in use if after many swap of the bit it is still good). However, two problems during the print ! Easy to fix (see pictures) - I think you forget to add support for the top part - On top, only one layer with the 0,20mm layer thickness. (I selected 0,12mm layer thickness in oreder to have 2 layer, better look and stronger)