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Thread: Qidi Tech 1 - Replicator 1 clone
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07-25-2016, 10:05 AM #2501
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- Mar 2016
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- 52
So, did a bit more experimentation: My motor VREF setting is 90 for X and Y. I was printing at a peak feed rate of 90mm/s and 130mm/s travel-only speed. Object sliced with Cura 2.1.2 and acceleration in Sailfish firmware was limited to 300mm/s^2 for X and Y. I notice that occasionally, acceleration is ignored and the print head races to its next starting point at the full 130mm/s travel speed! This results in a "bang" and the stepper motors skip and printing continues at a new location killing the print. I did some reading here: http://www.sailfishfirmware.com/doc/sailfish.pdf (READ SECTION 9.4). Sounds like Sailfish cannot "accelerate" a move if it doesn't know the last location (e.g. last location not saved in EEPROM). I wonder if Cura 2.1.2 does something to the gcode that could cause this "NON-accelerated" move phenomenon to occur randomly MID PRINT. 130mm/s without acceleration on a dual direct extruder Cartesian setup is painful to watch.... I am sure my 90 VREF setting is also reducing the amount of holding torque resulting in the steppers having insufficient force to overcome the momentum of a 130mm/s un-accelerated move - resulting in skipping of steps. thoughts?
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07-25-2016, 11:37 AM #2502
The print head never knows where it is at on a grid. The gcode isn't a coordinate system, it just says whereever it is now, next move 13mmX and 12mmY and extrude this much E plastic. Then repeat that 1000s of times. So did the belt skip a tooth? Maybe you shouldn't travel faster than say 90 with a fully loaded print head. Take the left stepper off if you want to do 120+ travels. As far as acceleration, all "sailfish" knows is it has to move 40mm in X direction and 30mm Y or whatever the move is. It doesn't care where it has been. It calculates accell based on how far it has to go.
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07-25-2016, 11:39 AM #2503
- Join Date
- Jun 2014
- Location
- Burnley, UK
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- 1,662
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07-25-2016, 12:01 PM #2504
True, and acceleration would be calculated by the distance between where it is now and where it is going. Both Absolute and Relative the the processor knows how far the move is and accelerates/decelerates as needed.
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07-25-2016, 12:42 PM #2505
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- Mar 2016
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- 52
Thanks for the information, but I am already aware of this and have taken measures to make sure that everything is tight and working properly. My issue is non-accelerated print and travel moves occurring mid print, which cause the motors to skip. I should be able to print at 90 mm/s and travel at 120 mm/s, or even twice those amounts, if my max acceleration setting of 300 mm/s^2 was working consistently... but it's not.
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07-25-2016, 01:00 PM #2506
What are your max speed changes? X and Y at about 7 or 8 is good. Max accell for X and Y at 750 is good. Even with those settings I wouldn't go over 90 with a fully loaded print head. 120-140 for travel is easily obtainable with the left stepper removed.
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07-25-2016, 01:13 PM #2507
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- Mar 2016
- Posts
- 52
Max speed changes are 7. Max acceleration for X and Y are 300mm/s^2. None of this matters when it comes to my problem. I am talking about intermittent loss of "acceleration feature" in the middle of a print... I could set my travel speed to 200mm/s and it shouldn't matter with my acceleration value of 300mm/s^2.
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07-25-2016, 04:58 PM #2508
- Join Date
- May 2016
- Location
- Annapolis, MD
- Posts
- 523
I may the last guy to the party, but I just found about a dozen videos on YouTube from QiDi. They cover basic maintenance activities for the Qidi printer, and include replacing: the extruder, half the extruder, the filament drive gear, the Zaxis motor and threaded rod, the thermocouple, and the extruder drive steppers. Also leveling the build platform, testing the X, Y and Z limit switches, tightening the screws on the X and Y drive stepper pulleys, building and installing the acrylic covers, and replacing the nozzle and PTFE tube (I always wondered what that big freakin bolt was for).
All of these turn up on You Tube in response to a search for "QIDI 3d printer", then apply a filter for this week (or today if you're snappy).
I expect that Qidi will eventually post these in their sticky thread.
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07-25-2016, 05:50 PM #2509
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07-25-2016, 06:16 PM #2510
- Join Date
- May 2016
- Location
- Annapolis, MD
- Posts
- 523
Design not printing solid
09-17-2024, 06:12 AM in 3D Modeling, Design, Scanners