[fabathome.org] Paragon at Fab@Home wrote this, this should be worth further exploration! On finding this fantastic website I emailed Evan with some thoughts and ideas that I have been working on. One of these ideas was with regards to using an electronic automotive fuel injector as a depositition tool. I had four injectors purchased via eBay which where like new removed from a mini. Over the weekend I carried out some basic tests. I hooked the terminals up to a MOSFET with the gate connected to the output of a PIC this allowed me to switch the injector on and off at various rates. I did not have a pump available so I used a large syringe that came with an inkjet refill kit connected to the input of the injector. Initially I filled the syringe with water to check the flow this flowed with no problem. I then filled the syringe with a hand cream called E45 (It was all I had available)in the UK this is fairly viscous so I was concerned that the injector would become blocked. I am pleased to say it did not. I then connected a very fine hypodermic needle (which was left over from building a gas turbine fuel injector and not drug abuse! ;-)) to the output of the injector on switching the injector on and off a consistent very fine interrupted stream was witnessed. --Paragon 15:24, 15 November 2006 (EST) https://reprap.org/forum/read.php?180,67507,67507#msg-67507 Mon, 20 Apr 2026 15:26:11 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?180,67507,67524#msg-67524 https://reprap.org/forum/read.php?180,67507,67524#msg-67524 I think stainless ones are available though, but expensive.]]> johnrpm Paste Extrusion Working Group Fri, 03 Dec 2010 09:44:23 -0500 https://reprap.org/forum/read.php?180,67507,67507#msg-67507 https://reprap.org/forum/read.php?180,67507,67507#msg-67507 fabathome.org]

Paragon at Fab@Home wrote this, this should be worth further exploration!

On finding this fantastic website I emailed Evan with some thoughts and ideas that I have been working on. One of these ideas was with regards to using an electronic automotive fuel injector as a depositition tool. I had four injectors purchased via eBay which where like new removed from a mini. Over the weekend I carried out some basic tests. I hooked the terminals up to a MOSFET with the gate connected to the output of a PIC this allowed me to switch the injector on and off at various rates. I did not have a pump available so I used a large syringe that came with an inkjet refill kit connected to the input of the injector. Initially I filled the syringe with water to check the flow this flowed with no problem. I then filled the syringe with a hand cream called E45 (It was all I had available)in the UK this is fairly viscous so I was concerned that the injector would become blocked. I am pleased to say it did not.
I then connected a very fine hypodermic needle (which was left over from building a gas turbine fuel injector and not drug abuse! ;-)) to the output of the injector on switching the injector on and off a consistent very fine interrupted stream was witnessed.
--Paragon 15:24, 15 November 2006 (EST)]]> ErikDeBruijn Paste Extrusion Working Group Fri, 03 Dec 2010 05:00:44 -0500