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vimes79

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  1. If I were making a desktop DIY 3Doodler type device then I would likely go for a base unit with a umbilical cord containing a Bowden tube and the wiring for the hotend, thermister and buttons. Then on the "Pen/Nozzle" end I would use a very small hot end, maybe a small J Head with a thick PEEK cover/insulator/body with the threads in the inlet for a compression fitting for the Bowden tube, a small cooling fan and encase everything into a custom pen like body (Easy enough to print in 2 halves and screw together, add two buttons for Fast and Slow extrusion with the wiring going back to the base unit and maybe a "Ready" indicator LED. For the base station I would use a decent and well tested Bowden tube type extruder system like the Air Tripper or the Mini Extruder from a RepRapPro Mendel, wire it up to a single stepper driver for the extruder and the necessary power control for the hotend and then have it all controlled by a nice and simple Arduino Uno, possibly a Mega or Due. Set it up so the two buttons on the "pen" give you fast and slow, have ooze control built in so that when a button is released it retracts some filament, but make this so it can be over ridden by a code change or even a simple push button on the base unit to toggle on or off depending on what you are creating and if you need the feature or not. Set the temp up so you can either manually turn it up or down to a custom figure from a Pot or switch/buttons or just have a set of pre set temps programmed and a single button to toggle through with a set of LED's or even a 7 seg display to show which is active. There is plenty of code available for an Arduino all over the internet for similar projects (not so much for a printing pen but plenty that the code would be similar for and easy to edit to your own needs. Add a 12v PSU and encase all the controls, circuits, wiring and such in a nice laser cut case with the extruder mounted on the outside for easy access and your ready to go. Just think along the idea of a handheld Hot Air Solder Rework/Reflow Station...
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