Direct-drive replacement for Wade type extruder

by Wired1 May 19, 2013
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So it's been a month. Was the torque of the non-geared nema 17 enough? I don't see any hotend attachment holes. How is the hotend attached? Is it a regular j-head?

No not enough for 3mm filament but fine for 1.75 as expected. I have moved on to other projects sorry and forgot about this :) The hotend is a regular J-type held in place with a piece of slotted aluminium like this plate: http://www.thingiverse.com/thing:89214http://www.thingiverse.com/thi... I have used this method for the last few extruders and it works very well and helps isolate the hot end temperature from the extruder body.

HotEnd mounting plate Reprap 6mm insulator groove

I like the nema 11 geared stepper but not it's price so...Could be the defining moment for changing to 1.75 mm filament.

The plate you linked to is printable but where did you find one out of aluminum? Make it yourself?

Thanks for the reply.

Yes I cut them out of 5mm alloy plate, best way to hot the hot end I have found so far. I am seriously thinking about going to 1.75 filament also for this reason plus the possibility of increased printing speed and reduced stress on the extruder/hot end. The only down-side seems to be the higher cost of the filament per kg.

Direct-drive extruder and 3mm seems quite a challenge. I could not get it past 40mm/s. If you have DVR8825 Pololu it is recommended as it can push almost double the current than A4988 without needing a fan (around 1.8A).

Yes it seems unlikely but I wanted to give it a try. I also recently bought a Nema17 with a 5:1 reduction gearbox on it which will be the backup plan :)

That one is a sure bet!

Modified this slightly and printing again, the first one was too tight for the motor on the bracket.

Printing now, I'll post photos when it has done.