After nearly poking my eye out on the z axis threaded bar I thought it was time to do a full risk assessment of the Ormerod. The attached files are for a new Z axis top mount and a simple top to cover the M5 threaded bar end. Clearance has been left to allow the bar to move freely in the mount and protect the user from possible eye loss. I would suggest printing in PLA would be fine. I have added a M5 extended nut, print with ABS and tap out the hole with a M5 tap set to use in place of the metal nut. The nut is a little tighter in the mount and so takes up the play. Simply print more when worn.