Best posts made by Alexander Mundy

Guess I should have said cut the inner strands part way so that when you pull through all strands are in the connector.

Edit (Here was the wrong results I removed)

If this works, here is the spreadsheet

0_1531949228706_M592 Spreadsheet.xlsx

What I was taking exception with was working live chassis and not being overly excited about it on a learning forum. I was referring to myself as the long time electrician, over 30 years and I am now the owner of an electrical contracting company. Prior I was an electronics bench technician, signal technician for the City, then signal supervisor. Also an amateur radio operator and from before a teenager mentored by a retired Navy avionics electronics technician.
I don't mention my past as bragging, but to say that all of my teachers taught respect for line voltage as have I to my apprentices throughout the years and to my employees. The worst I have ever had it was accidental contact with 120V. I was probably 10 years old and working on an old live chassis AM radio. It locked up all my muscles and I could not move while it felt like a million ants crawing over me. I was soaked from sweat and in contact with concrete. Needless to say at that point I was overly excited about it. Fortunately I thought of what I had been told and completely relaxed and fell off of it. Should have been using an isolation transformer as we did as bench technicians.

I have drawn this too far off topic and will stop here.

Dredging this up as I would also like to see at least an option to include M81 in the event of a heater fault at idle and judging my the other threads I ran across searching many would. I'm one that likes redundancy to my redundancy. I'm running what most would consider overkill with my printer that has a 120V bed. 2 SSR's and a relay activated by PS_ON for the bed, and the hot end heater also through a relay activated by PS_ON.

Edit: Forgot to mention I do also have a one time thermal fuse in the bed heater.

Sorry, should have mentioned I have no intention of using the aluminum frame it came with. Was thinking of possibly making it an add on mount for my lathe/mill or possibly building a stand alone micro for very small (less than an inch work piece) mill. I didn't know if the polar kinematics would be appropriate since I have the parts to implement that.

During delta calibration it would be nice if it automatically ended after an error instead of going through the rest of the probing, or at least an option to make that happen.

If it's close but you just can't seem to get all the strands in a crimp connector a trick I was tought a long time ago is to strip longer than needed, splay the strands, cut some of the inner strands, twist back together and pull through.

@lakko the 1st added, etc spreadsheet is a recursive spreadsheet that takes into account (6 times IIRC) the fact that the computed amount to add doesn't really get added fully since that amount will also be less than directed due to non linear extrusion of it and sums up all the amounts. That part will fill itself in.

@dc42 said in Filament Monitors - Closed Loop Extruder?:

This is something that we plan to try with the magnetic sensor when we have a stable mechanical design. In principle, with a filament monitor between the Bowden tube and the hot end, we could calibrate pressure advance automatically, and if necessary implement more advanced algorithms such as non-linear pressure advance.

I have started working on these same 2 calibrations as a personal project with a sensor and independent processor / display platform in what little spare time I have. That is how much I think it will save calibration time, so if you implement them directly in Duet and with a commercially available sensor I think that would be a major attraction.

https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater

Toward the bottom

"Configuring bed hater"

Just a follow up note I learned yesterday. I bought a micro SD to micro SD extender to use with a PI 4 in a custom printed case for a digital dash display and it did not boot correctly. A little googlefu led me to https://forum.4dsystems.com.au/node/43404/page2#post55236 . There was a 330 ohm resistor on this new extender board between SCLK and VDD. Crushed (crude but effective) the 330 SMD resistor and it booted fine.

@lakko I went back and looked. The extruded amounts in the lower cells in column H are to be entered based on the extruded amounts after applying non linear extrusion. It is only there to see how far off the results are and to give me a compensation in steps that will get me close to an average of 100% since there isn't a "C" (offset) value that can be entered. Yes, the formula looks correct based on the data entered. Give it a go and run the test again then enter those values in column H.

Now I feel stupid, was looking for an edit title. It's at the top when doing a regular edit. Thanks.

I did away with all the settings and interaction problems by going to Portescap P430 258 005 01 3.6 degree ultra low rotor inertia disc permanet magnet steppers for my Nimble extruders. I'll never go back to conventional steppers with a high ratio extruder after using them, they are like a sports car vs a Yugo for starting, stopping, and reversing direction in comparison to the suggested Nema 17 pancake and Nema 14. Expensive new, but they can occasionally be found used at a decent cost.