The anti-slip rubber on the screwdriver handle broke, so I designed a replacement. 

Print from PETG, 100% infill, 2 perimeters, 0.2 layerheight, print orientation as in the last photo, set a pause in the slicer to insert a cylinder magnet measuring 5x5 mm. After printing, as shown in the penultimate picture, cut all around to a depth of 2mm to release the end part of the handle and allow it to rotate freely.