Water Sprinkler (for UK/AU/NZ hose fittings) by gruvin

Last crawled date: 3 years ago

This is a remix / inspired by thing:414552, by @falcon20cne.
UPDATE: 2021-01-27: Re-redesigned from scratch to be MUCH more efficient. New spinner and base. Both need replacing for full gains, though just the spinner is already a vast improvement -- especially for lower available water pressure.
YouTube video of new design in operation: https://youtu.be/4ZXLrBzt4Xw
The hose fitting thread has been changed to BSP 3/4" (from original author's version). This is the British / Australian / New Zealand and European(?) standard. The US uses something different.
Printing Specs
I printed mine at 210ºC in PLA+ -- 5º hotter than usual, with FOUR (4) perimeters, 50% GRID infill, 0.2mm layers, using a 0.4mm nozzle. Nozzles up to 0.6mm should be fine. Spinner blades may have minor issues with thicker than 0.2mm layers.
Other Materials
PETG and ABS not recommended due to stickiness / friction on axle screw, respectively. A nylon or PLA washer fixes that though.
Axle
The axel uses a stainless steel, machine cap-screw, length >= 30mm. You can drill the base's screw hole out to 3mm and use a nut and screw (water pressure will separate parts from friction) --OR-- leave the hole at ~2.5mm and forcibly screw directly into it. This relies on friction to hold the screw firmly in place. You could also M3 tap the thread and install a locking nut in the cavity below the base part -- or even half tap and use friction locking in the last few turns. No machine screw? How about whittling a piece of bamboo chopstick? The options are endless! :p
Under / Over Extrusion
Over extrusion can make the hose thread too tight, while under extrusion may cause water leaks under pressure.
To save plastic and time, you might want to print just the thread portion, to test your settings before committing precious PLA to the whole base. In Prusa Slicer for example, you can "split" the part to cut off just the threaded portion and print it, alone.