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Uses 1-2pcs of  32mm x 3mm (1.26 x .125 inch) magnets to grab a magnetic part. Secure it with a bead of hot glue. 

Also requires one ¼-20 button or socket head screw. 

Press the  release lever in the handle to drop the part. 
 

Print it heavy. 2.4mm walls and 25-40% infill to make it strong. Print the lever on its side with support.