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New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-01-Aug
by KDog
Hi All,

Still have a bit of calibration to do but wanted to show off my Bowden modded PBJ. I'm going to print out a fan mount for the extruder motor (It can get hot!) and am working on a new fan setup for printing PLA (yes...I took a saw to my printer!).

The extruder is the PG35L Microextruder from Ultibots.com. I bought the stepper and the hardware kit from them and printed the rest in ABS. http://www.thingiverse.com/thing:42112

The hotend mount is the Ubis Bowden mount at http://www.thingiverse.com/thing:104005

One question: I attached the wires for the extruder fan to the two extra pins on the hotend header. I assumed this would work as the heated bed uses both sets of pins on the connector next to it. However...it doesn't come on when I turn the hotend on. Didn't check if the pins were active and have the board installed and tucked away. Hate to pull everything out again.

Any comments are appreciated.

Cheers,

KDog

Re: New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-08-Aug
by RetireeJay
KDog wrote:One question: I attached the wires for the extruder fan to the two extra pins on the hotend header. I assumed this would work as the heated bed uses both sets of pins on the connector next to it. However...it doesn't come on when I turn the hotend on. Didn't check if the pins were active and have the board installed and tucked away. Hate to pull everything out again.


The heaters are turned on and off at intervals in order to maintain a set temperature, so your fan will only run intermittently. The Printrboard has a connection point specifically for a fan; why not use it? viewtopic.php?f=6&t=3922

Re: New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-13-Aug
by KDog
I was saving the fan header for the hotend for printing PLA. My thinking is that the extruder fan will be on all the time and not on the same circuit as the hotend fan. The only reference I found concerning this was someone who hooked it up the the hotend resistor but, of course, that makes no sense given the on/off behavior of the heater circuit. Are there any other pins on the board that can provide the power for a fan?

Re: New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-13-Aug
by RetireeJay
If you get a fan that runs off 5V, I guess you could use the spare "endstop" connector. Usually that's the "E-Stop" connector, but sometimes E-stop and Y-stop get switched. Anyway, these three-pin connectors have Ground, +5V, and "switch" connections. The "Ground" end is toward the power connector end of the board; the "switch" pin is toward the thermistor plug end of the board.

Re: New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-15-Aug
by mrsamnc
Looks good KDog. I'm sure you'll make a few people pee their pants by cutting your bot, but hey... whatever you want to do! :D

Was this your first Bowden? What was your experience with it? I've put my bowden plans on hold right now to work on a DDE conversion personally, but am still eager to see/hear other people's experiences.

Love all the photos! Keep 'em coming.

-Sam

Re: New Bowden Mod on my PBJ

PostPosted: 2013-Aug-Fri-15-Aug
by Lemm
can you post first print results ?
I'm back from bowden cause I can't handle the filament stripping while moving.