Design Concept I just needed to hang some things at more convenient place, you also need it. So take and print some hooks. Print Settings K1 printer, very fast 4 and 5 minute print times with Hyper-PLA, 6% infill, 0.3mm layer height, 3 walls, 0.4 nozzle, no supports, no brim! No assembly, but you could use screw at backside of slim version to stop sliding, also the cap is 17mm wide, should fit for most shelf doors, if it is too loose, use double sided tape. Also in some cases hooks can function as child lock if thing hanged there have very little clearance from top overhang.