Pump sump/reservoir for Hot end coolant.
thingiverse
Pumps the aquarium: Uses dx.com http://www.dx.com/p/334988 pump the water to push it through the tubing. First prints leaked slightly with 2mm wall thickness in the reservoir, trying setting wider nozzle size used now, slower printer running also ensure pushing extra volume of filament builds much better bonding between layers. Set print speed 100% fill too! Tall rostock mounted less than 500mm above top water tubes to aid priming, if using this setup it seals self priming way. Protective plastic sheet towel down then use siphon start seal up afterwards.
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