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Thread: Itty Bitty Double Extruder
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12-04-2014, 08:13 AM #61
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12-04-2014, 08:39 AM #62
I'm thinking about switching to ATX since so many accessories need 5V now. I don't like that it doesn't fit as well on the frame of the printer, and they are a lot more expensive. Especially if you spring for one with the nice modular cabling. In the meantime I'm going to try running an RC Battery eliminator if I pick up anything else that needs 5V.
I'm considering trying a heated enclosure, because i need it for fume extraction at a minimum. I get headaches if I'm near the printer when it's going. If I do that it will be a good excuse to move the meanwell 12V supply to that and get something new for the printer.
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12-04-2014, 01:44 PM #63
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- Apr 2014
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- Atlanta, GA
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The changes I see which are specific the dual extruder (ABL support ignored) are in Configuration.h:
#define MOTHERBOARD 34
#define EXTRUDERS 2
#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 1
#define HEATER_0_MAXTEMP 280
#define HEATER_1_MAXTEMP 280
#define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 4000, 644.2}
I saw a change in Configuration_adv.h, but I'm not sure if it's extruder related (?):
#define DEFAULT_STEPPER_DEACTIVE_TIME 150 // Makerfarm default was 60
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12-04-2014, 02:22 PM #64
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- Aug 2014
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- 7
I'd definitely be interested in a full kit at some point, but at the moment I'm still getting to grips with my basic 10" i3V
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12-04-2014, 07:06 PM #65
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- Jul 2014
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- Eastern Colorado
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12-05-2014, 02:24 AM #66
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- Nov 2014
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- Orange, CA
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so when you get setup max your Z hit home z and a stop watch then set DEFAULT_STEPPER_DEACTIVE_TIME
to the the stop watch + say 15 to 30 sec just to be safe
sounds like a good idea
i plan on doing something like this http://youtu.be/jguPioUpYtc?list=UU9...nutKg06BitOByg
as well
waiting on http://www.stamps.com/shipstatus/sub...99561698334613 (extra hexagon 1.75mm hotend)
plus belts from mcmaster
on a side note (as posted on thingiverse)
I'm using a custom built SMPS yes designed and built by me a long time ago (about 6 years now)
for more then a few reasons witch i wont get in to mostly because i have it and i can run it at just about any voltage i wantLast edited by TechMasterJoe; 12-05-2014 at 03:11 AM.
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12-05-2014, 11:05 AM #67
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- Jul 2014
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- Eastern Colorado
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- 536
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12-05-2014, 11:42 AM #68
I think the numbers are far worse than that. The stock HOMING_FEEDRATE is set to 50 mm/minute, so an 8-inch printer will take four minutes to home full scale 200mm in Z, up to six minutes for 300mm on the 12-inch. I've previously doubled the HOMING_FEEDRATE to 100mm/min, and just timed full-scale Z home to still take 2 minutes 5 seconds on my 8-inch printer to validate the data. I've tested higher Z feed rates, but I found my Z-motors get pretty skippy at just over Z travel rates of about 2.5 mm/sec. I've left the DEFAULT_MAX_FEEDRATE for Z at 2 mm/sec in order to ensure margin. I could probably get by with a Z HOMING_RATE of 120mm/min to match the 2mm/sec max feedrate.
Yes, doubling the HOMING_FEEDRATE also doubles the rate used where the Z motors are moving slower for the more accurate part of the homing. I haven't seen any issues with this on my non-ABL printer. If I had, it wouldn't be hard to refactor the firmware ratio for the slower part of the movement. Making adjustments in ABL firmware would be a bit more complicated since the HOMING_FEEDRATE factors into a lot more movements for ABL.
I'm starting to think that especially the larger printers are screaming for a retrofit of 8mm ACME lead screws instead of the M5 threaded rods. At 2mm pitch vs 0.8mm pitch for M5 rods, the Z feed rate should be able to go up by a factor of 2.5 with the ACME screws.
Apologies to clough42 for continuing the sidebar discussion.Last edited by printbus; 12-05-2014 at 03:20 PM. Reason: clarity
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12-05-2014, 02:09 PM #69
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- Oct 2014
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- 8
Hi
I'm guessing the gears should be printed in PLA.
Should the rest be done in ABS or PLA
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12-05-2014, 03:08 PM #70
Generally anything near the hotend should be ABS rather than PLA. So the fan shroud, x carriage plate, main block and the double groove mount plate should be run in filament able to withstand higher temps. I printed the rest in PLA.
New to 3d printing looking for...
05-20-2024, 12:56 AM in Tips, Tricks and Tech Help