polo 6n (and probably lot more old VW's) rear window sprinkler replacement

thingiverse

Rear window sprinkler for one retro car in my collection went out and stopped working long ago. Trying to clean up smudges on rear windshield with random squirts of spray while trying to wipe away smears from cleaner might look hilarious in a YouTube video, but people who own those cars really don't find it funny, so I decided to print new nozzles. It will fit 1996 VW polo 3-door versions without any issues. Possibly it may work with other models produced during this time frame (roughly until 2001) like Jetta or Golf as well. There are three options available for the model - v2 has a bit larger nozzle sizes, so go for that one if your printer isn't reliable in printing v1 version. v3 seems to be final. It now correctly sprinkles liquid where it's supposed to and can be locked securely. It also got an improved design that allows excess fluid to fall off from the bottom instead of damaging the VW logo underneath. It has minimal overhangs left as well. Instructions for Assembling After you're done with printing, use a sharp knife to remove supports on the inside. A (stainless) nut should be applied in one spot - in order to fit it into place properly, you may need to apply some heat first. The wiper locking nut can either be installed using hardware or software options. Both methods work. Software Installation You have to open up blender file and adjust the 'wiper lock nut' position along z axis, rotating if needed and also make necessary adjustments with 'locking parts'. Hardware Option You will need a certain washer or at least forceful effort (preferably of well-balanced proportion). Place it where nozzles are in top position when sprinkler is installed, once the proper placement of nut has been confirmed. You might then want to try fitting the new wiper on top of it - if they fit together too loosely use hobby knife or file and take some additional turns with force to ensure it becomes snug. Before putting anything in its final place do a full check test even when locking isn't turned, as there may still be an opportunity to make necessary adjustments. Considering the nozzle's pressure will create decent vacuum after it seals, glue can serve your purpose. Make sure the solution (such as acrylic or silicone) is totally dry before turning sprinkler back on for operation. Lock nut has also been integrated in this mechanism so when sprinklers fail working accordingly (it actually did with my prototypes) you have chance of changing some adjustments from original file which provides source code from where it was made - hope this might be useful for users experiencing similar issues. Good luck.