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Making a soft plastic mold injector

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Been looking for a "less expensive" one myself.  The best I have found are the following:

http://store.do-itmolds.com/Medium-Injector--4oz_p_325.html

http://store.do-itmolds.com/Large-Injector--95-oz_p_269.html

We want them to be safe, but, wow, a little expensive for hobbyist and low volume production.  Good luck.

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At one point there was tutorial on how to make one using i think some kind of pressure pot.that locks..you add air line from aquarium air pump then drill and tap and screw in a brass shut off facent valve.when you open valve it will flow thru.problem it won't work with glitter or anything that setles with adding a paint mixer to it... Then I imagine you will have trouble with flow rates if your make larger multi up cavity molds.. 100 up

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