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Made some progress last night, drilled through the pulley and drive shaft. Then ran a self tapping screw through it.
Lifted a bit where I didn’t have tape, and it showed signs of the extruder slipping towards the end of the print. But overall fairly solid, just need to get the speed up a bit more now.
Been away for a bit, but it’s time to work on it some more. Planning to update the endstop holders to better fit the shape of the sensors I’m using.
Pretty cool that there is a local group, small world. I’m actually looking into it right now, however the join function of the site seems rather broken/disabled at the moment.
I found that issuing G1 commands to any coordinates would replicate it. Symptoms seemed similar to skipping steps. Lowering the maximum X/Y feedrates, and X/Y acceleration seems to have mostly fixed it. No idea why it did, but it resolved it for now. May just need to bump up my driver current a bit.
The really big issue I need to resolve now is shaft slippage causing some X/Y drifting. However, at lower speeds I am getting usable prints. And infact got my first usable object, a fuel door latch for a Land Rover.
I had the exact same issue, getting absurd calibration numbers. Seemingly random movements, sudden reversing, X/Y coordinates that made no sense etc.
Turned out the firmware provided, combined with the first RAMPS 1.4 wiring diagram I found on Google was moving the motors backwards in my case. Flipping the connectors around on both X and Y motors, and resetting everything back to defaults solved this. Next attempt at calibration was simple with no issues.
The duct tape belts are just duct tape folded over 4 times, I don’t see it working on many other types of printers. The joint is quite thick, but because of the large diameter pulleys I can just have it facing towards the back. It’s not substitute for real belts, but as you mentioned and the way I’m using it is perfect for repstrapping a Morgan.
I viewed the gcode to make sure it didn’t have anything odd in it, that looked good. I changed some speed settings in the firmware and it seems to have fixed a lot of the shuttering at the cost , though there is some only while printing still. I loaded the defaults you provided (LQ15.ini in this instance).
Currently I’m using it to print some updated parts for my printer, and adjusting it along the way. However it’s looking very close to being properly useful. I have to say this design is extremely tolerant of errors during construction (In my case hand cut parts, hand drilled platform, SAE parts easily modified to fit, cut z-axis support brackets), amazing job on the design Quentin.
Success! (Sort of.) while my thread is pretty lacking in the build I finally got it to print for the first time.
Problems I encountered during calibration:
1. X, Y, and Z axis were all reversed. Flipping the connector solved almost all my issue with my calibration failing to do M361 properly. And the arm collision issue.
2. Had issuesCurrent and primary issues:
1. Motion while printing is extremely jittery giving a very wavy appearance to all parts. All other movements outside of printing are very smooth. (Not sure how to fix this yet, any input would extremely welcome)
2. Duct tape drive belts, need to be replaced with real drive belts, however they are working and do not seem to be slipping.
3. Homing command needs to be reversed in software.
4. Proper mounting of hardware to case.
5. Wiring clean up, looks downright awful.Just saw that the flowchart was updated, and that solved a lot of the confusion for myself. Massively appreciated, as it’s quite well done. Next issue I’m running into, is that I seem to be making some error during the calibration.
As it just seems to be swinging around the wrong way, colliding the arms together, and I can’t get it to head anywhere near where it’s meant to go so it seems. Only way I’m able to get it over the build platform is by increasing the X and Y limits quite a bit Obviously, I’m making errors during some portion of the setup procedure. Just not sure where yet.
