Cherry Pi III Is Available [attachment 33656 Forumversion.jpg] Hi Guys Check out my new version on Thingiverse http://www.thingiverse.com/thing:344408 Andy https://reprap.org/forum/read.php?178,361141,361141#msg-361141 Wed, 10 Jun 2026 05:22:34 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?178,361141,876084#msg-876084 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,876084#msg-876084 nka Delta Machines Thu, 13 Aug 2020 20:26:45 -0400 https://reprap.org/forum/read.php?178,361141,876073#msg-876073 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,876073#msg-876073
[attachment 116399 pi_parts.jpg]

On top of that (not pictured) is the extruder, minus the motor.

Also, for an extra £5 I can include a 12v MK3 220mm dia aluminium heated bed with thermistor.

Regards,

Les]]> Pointy Delta Machines Thu, 13 Aug 2020 14:08:08 -0400 https://reprap.org/forum/read.php?178,361141,875922#msg-875922 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,875922#msg-875922
Quote
Pointy
Sorry to drag up and old thread, but I have a set of 3d printed parts for the Cherry Pi III, is someone just wants to bung me a fiver for postage.

I think it is pretty much a complete set, including delta rods and springs.

Regards,

Les

Sent you a PM (tu)]]> Ohmarinus Delta Machines Sat, 08 Aug 2020 04:04:14 -0400 https://reprap.org/forum/read.php?178,361141,875912#msg-875912 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,875912#msg-875912
I think it is pretty much a complete set, including delta rods and springs.

Regards,

Les]]> Pointy Delta Machines Fri, 07 Aug 2020 09:11:42 -0400 https://reprap.org/forum/read.php?178,361141,775271#msg-775271 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,775271#msg-775271 (Big fan of the online calibration calculator, btw.).

-Matt]]> mkeveney Delta Machines Tue, 27 Jun 2017 20:18:28 -0400 https://reprap.org/forum/read.php?178,361141,775267#msg-775267 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,775267#msg-775267
To control a mains voltage bed heater, you use a zero crossing DC-AC solid state relay. Type SSR-25DA is a popular choice. PWM control is possible if the PWM frequency is low enough, for example RepRapFirmware uses 10Hz for the bed heater.

Silicone heaters are generally used. One reason is that most other common types don't have good enough insulation for the higher voltage.

See the link in my signature for more details of the delta printer build in that photo.

HTH David]]> dc42 Delta Machines Tue, 27 Jun 2017 18:40:21 -0400 https://reprap.org/forum/read.php?178,361141,775260#msg-775260 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,775260#msg-775260
Quote
dc42
Les, how big is your printer? If it isn't too small, you could consider using a mains-powered bed heater (easy to do safely on a delta), then you can use a single smaller PSU and fit both the electronics and the PSU under the bed as I do:


Ping dc42,

I realize this is an old post, but I'd like to know more about this approach. My web searching found a lot of scattered, incomplete and out-of-date information.

Is there a definitive link or forum post somewhere that presents all the latest options for 'mains powered' heat-beds?

Specifically: what kind of heating elements are available... are the 'silicone' heaters the latest thing?

What kind of interface to my controller board? With such a setup do I get PWM control of the heatbed? Is it necessary? ...etc.

TIA!

-Matt
]]> mkeveney Delta Machines Tue, 27 Jun 2017 17:28:08 -0400 https://reprap.org/forum/read.php?178,361141,762183#msg-762183 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,762183#msg-762183
its been a while! :)

My Chery Pi 3S is still running, but I was wondering if there's any carriage with belt tensioner? I don't like the squezzed screw system :)]]> nka Delta Machines Thu, 13 Apr 2017 19:31:42 -0400 https://reprap.org/forum/read.php?178,361141,752111#msg-752111 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,752111#msg-752111 jjazzyj Delta Machines Tue, 28 Feb 2017 10:00:27 -0500 https://reprap.org/forum/read.php?178,361141,752109#msg-752109 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,752109#msg-752109
Quote
mrorange26
Was wondering what firmware to run on cherry pi as havent upgraded my for a year or so and wanted to add inductive sensor.

I run the latest Repetier Firmware, it has a few issues I've noticed like small stalls when I print from the Pi based Repetier server. I've mostly resolved those by changing my serial port speed to 250000. I have the switch based probe but I don't really use it. Even inductive probes in my experience aren't very consistent. On my CoreXY with a 3mm aluminum bed it can be off by 1mm which is crazy. I only use it as a Z min now and have manually leveled it. CoreXY's are louder than a delta but once you calibrate them they don't really move too much. Especially if you have dual Z screw.

dc42's IR probe seems far more reliable to me, I haven't used it though but it seems that it would be much better.

I'd say unless you are running the Duet with the IR probe it's probably better to manually level a delta using dc42's least squares regression model. And use 7 factors vs 6 I couldn't get RMSE below .5 until I did. On my Cherry Pi XL my RMSE is .05 and that's still too high, so I still have some work to do. I'm hoping that getting to 0.03 isn't too onerous.]]> jjazzyj Delta Machines Tue, 28 Feb 2017 09:59:08 -0500 https://reprap.org/forum/read.php?178,361141,751975#msg-751975 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,751975#msg-751975
I have an E3D v6 Clone which works fairly well, there are a few variants on this. Most have a throat that have a PTFE insert for some reason. I switched that out for a the all metal one which is how the real E3D is. I also added a Volcano Heat Block and a .6mm Nozzle which suits the type of single wall "spiral vase" prints I plan on making with this. PETG makes fantastic prints like this with larger nozzles. You can still do .2 layer height normal prints that look great as well. I'm using the "Modicum" extruder as it has zero backlash and can handle flexible filaments with ease. I like geared extruders as they have better quality than direct drive. I'm using Maso's effector for the E3D v6 and 8mm balls. The largest 6mm rods I could find were 300mm which I know would be a little short for a full 300mm diameter print area. I get about 260mm. dc42's suggestion for 350mm rods on the XL (in a different thread) is correct. In fact Repetier Firmware won't let you exceed 260mm thanks to it's safety calculations (I know I can push it further FYI but it gets a little sketchy and I've had the rods explode out pushing it past 260mm on certain movements before)

Calibrating this monstrosity is quite a lot of work, smaller diameters are more forgiving to calibration errors. I used dc42's Least Squares Regression Delta calibration model and once I purged my EEPROM and reset the autolevel and chose 7 features vs 6, I reached convergence quite quickly. With only using 6 features I had issues with the space between towers being higher than at the towers pretty consistently and could never get below an RMSE of .5. Once I had the rod length feature added I got down to .05 in three passes.

I have an old Raspberry Pi B mounting to the side getting 5.1v from a LM2596 based DC-DC Buck. That module is in it's own little T-Slot case on the inside.

Here's a few pics:

Initial Build:



Initial Print (Desk Garbage Can):



Initial Print in Action:

[goo.gl]

Finished Print:



Layer Close Up(Just fantastic layer registration, until I switched my franken CoreXY to TR8*8 leadscrews had the best out of all my printers)



Fitting the Heated Bed and top cover(I messed up cutting one of the angles sigh, off by 15mm):



Re-doing the wiring and installing the power supply:



Mostly Finished:



Initial fitting of the Raspberry Pi B based Repetier Server:



I have successfully printed quite a few things now, I'm monitoring to see how well the final calibration holds, and if I need to use Repetier's autolevel routine to keep things there. My only issue with the switch based probe is that the "Bend" correction of the probe is quite different based on where it's probing, the way the probe works on Maso's effector variant doesn't trigger properly in a lot cases. I've managed to calibrate the three probe points for the autolevel routine in Repetier but it's not exactly ideal.
]]> jjazzyj Delta Machines Mon, 27 Feb 2017 17:37:55 -0500 https://reprap.org/forum/read.php?178,361141,751347#msg-751347 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,751347#msg-751347
Is the CAD Source available for the Pi IIIs?

I want to make a custom effector part for my PI, but my modeling program doesn't work well with imported STL files.

Actually, I think all I really need is the center-to-center spacing of the sockets, if that's easier.

-Matt]]> mkeveney Delta Machines Fri, 24 Feb 2017 16:12:32 -0500 https://reprap.org/forum/read.php?178,361141,711983#msg-711983 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,711983#msg-711983 mrorange26 Delta Machines Wed, 05 Oct 2016 19:30:57 -0400 https://reprap.org/forum/read.php?178,361141,702829#msg-702829 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,702829#msg-702829 3DRapidClone Delta Machines Tue, 23 Aug 2016 22:26:14 -0400 https://reprap.org/forum/read.php?178,361141,694588#msg-694588 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,694588#msg-694588 Im in weston super mare.]]> mrorange26 Delta Machines Fri, 05 Aug 2016 16:34:06 -0400 https://reprap.org/forum/read.php?178,361141,693306#msg-693306 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,693306#msg-693306
Quote
dc42
Quote
Pointy
Do you have the sensor boards in stock Dave, should I just order from escher3d?

Yes, I have them in stock (so does Filastruder for those in the USA).

Thanks Dave, I put in an order.

I finally got to print a few test pieces and the results were encouraging, especially considering i was using the 3 year old filament that came with my Ormerod. I had a few problems with the extruder, which were fixed by upping the temps 5 deg. More testing and tweaking required though.

I still like the idea of using the metal corners, and while I was unable to find a complete drawing of them, I did find a 3d model on these forums. Overlaying it over the plastic parts, I can see quite a difference...

[attachment 82081 cpmetalcorners.jpg]

Assuming it is accurate, the frame would move inwards 3mm, which other than screw up my bed and Smootheboard mounts, I don't think was cause any other issues. I would however need to make the profiles 25mm longer to keep the uprights relative to where they are now.

Regards,

Les]]> Pointy Delta Machines Mon, 01 Aug 2016 09:44:06 -0400 https://reprap.org/forum/read.php?178,361141,692803#msg-692803 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,692803#msg-692803
Quote
Pointy
Do you have the sensor boards in stock Dave, should I just order from escher3d?

Yes, I have them in stock (so does Filastruder for those in the USA).]]> dc42 Delta Machines Sat, 30 Jul 2016 08:41:01 -0400 https://reprap.org/forum/read.php?178,361141,692802#msg-692802 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,692802#msg-692802
Quote
dc42
Les, how big is your printer? If it isn't too small, you could consider using a mains-powered bed heater (easy to do safely on a delta), then you can use a single smaller PSU and fit both the electronics and the PSU under the bed as I do:

No big enough for that., I have just enough room for the Smoothieboard & Motors...

[attachment 81991 CPIIIBaseFrame2.jpg]

Unfortunately, not much progress to report. While printing a modified version of dc42's 300W PSU cover on my Ormerod, the clip that holds the bowden tube in broke. :( (Why does it always go wrong 90% into a long print, I think it was about 5-6 hours in) Fortunately I had a spare, and I have managed to get it printing again. I think the heat from about 14 hours of printing made it go soft, which has prompted me to design a version of the Modicum extruder for the Ormerod...

[attachment 81992 ormerodmodicumextruder.jpg]

Anyway, the M5 screws finally arrived today, so I am hoping I can get the heated bed fixed down and actually try and print something over the weekend.

Do you have the sensor boards in stock Dave, should I just order from escher3d?

Regards,

Les]]> Pointy Delta Machines Sat, 30 Jul 2016 08:26:13 -0400 https://reprap.org/forum/read.php?178,361141,692453#msg-692453 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,692453#msg-692453

]]> dc42 Delta Machines Thu, 28 Jul 2016 16:00:13 -0400 https://reprap.org/forum/read.php?178,361141,692414#msg-692414 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,692414#msg-692414
Quote
dc42
There are no traces near the top edge of the IR sensor. However, you should make sure that the ground plane on the underside of the board cannot short against the heatsink.

I could move it down by 1/2mm, as it's currently set to 1.5mm above the nozzle. I see that when I overlay your mount, the sensor is only 1mm above the nozzle. Have you had any problems with the sensor board catching blobs on the print?

In other news, more progress has been made...

I designed and printed a front connector box for the USB, ethernet, reset switch with status LEDs for the 12v power, Hotend and heated bed. I also designed and printed a separate power connection box using a Cliffcon 4 Pole Touchproof connector. Using this connector allows me to bring 2 separate 12V lines into the box, using some 4 core 1.5mm flex. One line will provide power to the Smoothieboard & motors, while the other will power the hotend & heated bed. Each is protected by a 10A fuse. While I was at the wiring I ran 3 wires over to the hotend, ready for a sensor. This turned out to be a challenge and meant I had to remove the heatshrink & sleeving and replace it with some spiral wrap.

Thinking of how to mount the heated bed, I came up with this...

[attachment 81938 CPIIIBaseFrame.jpg]

3 pieces of 10mm square aluminium bar, fixed to the profile in front of each tower and then the heated bed will be screw into it with M3 countersunk screws. I have the bar cut, the 5mm holes drilled, and the heated bed holes have been countersunk ready. I am just waiting for some more screws to finish it off. I was also wondering how to stick the cork sheet to the underside of the heated bed and thought about using some Evo-Stik Serious Stuff Grab Adhesive, it will apparently easily resist 100°C continuously and as I am only going to be printing PLA on this machine, it might be worth a try.

Lastly, I am my fourth tweaked design of JK11's belt driven Modicum extruder, and think I finally have it how I want it. I feels silky smooth when turning by hand and I can't wait to actually try and print something with it!

I'll maybe try and grab some pics once it's all back together.

regards,

Les]]> Pointy Delta Machines Thu, 28 Jul 2016 13:24:54 -0400 https://reprap.org/forum/read.php?178,361141,691617#msg-691617 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691617#msg-691617 dc42 Delta Machines Mon, 25 Jul 2016 14:25:04 -0400 https://reprap.org/forum/read.php?178,361141,691549#msg-691549 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691549#msg-691549
[attachment 81797 sensor_1.jpg]

[attachment 81795 sensor2.jpg]

[attachment 81796 sensor3.jpg]

You can see from the first image, the board is just about 0.25mm too high, but I am hoping there are no traces close to the top edge so I can file it down a tad. I would also probably have to solder the connecting wires directly to the board, as I don't think there is room for the connector/pins..

I'll have to print one and the board to test it.

Regards,

Les]]> Pointy Delta Machines Mon, 25 Jul 2016 10:08:02 -0400 https://reprap.org/forum/read.php?178,361141,691482#msg-691482 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691482#msg-691482
Quote
dc42
I attach an OpenScad model of the IR sensor. There are some designed for printable mounts linked to in the fitting instructions at [miscsolutions.wordpress.com].

Thanks for the model Dave, looking at your mount, there is about 3.3mm between the back of the PCB and heatblock, is this the absolute minimum you would recommend?

[attachment 81777 sensor_distance.png]

Quote
dc42
I have the Robotdigg 2020 aluminium corners. They look very similar to printed corners, however my previous printed corners were for 1515 extrusion, so I can't say whether they are direct replacements for standard printed 2020 Kossel corners.

I was thinking that I might have to adjust the carriages, but I guess the top idler would be adjustable. Are there mounting points for the end stop switches?

Quote
dc42
I have found microswitch endstop sensors to be entirely adequate and very reproducible - but I guess it depends on the quality of the microswitch and how you use them.

Maybe mine are just cheap and nasty, I already had to replace a couple of them. I have ordered some of those hall effect sensors to play with anyway.


The heated bed isn't as bad as I thought, it was more a problem with my temperature probe. 8-) I had no data for the 100k thermistor, so after spending to time calibrating everything, I think it will be usable.

Regards,

Les]]> Pointy Delta Machines Mon, 25 Jul 2016 04:30:47 -0400 https://reprap.org/forum/read.php?178,361141,691432#msg-691432 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691432#msg-691432
Quote
Pointy
As it's well over a year since I started my CP III, I think it's time to dust of the cobwebs and get it finished. ::o

From memory it's pretty much ready to go, I just have to fit the heated bed and finish the new belt driven extruder. I also remember it being a real pain to calibrate, so I think a Z probe is in order, After catching up with 20 odd pages of this thread, it seems there are 2 sensible options, DC's mini IR board or the inductive sensor. The inductive sensor looks really big and heavy and is going to be harder to get close to the nozzle than DC's board, so at the moment I am swaying towards the latter. Do you have a CAD model or Tech drawing of your board Dave, so I can see how I can mount it?

I have seen Aluminium Corners mentioned, are they just direct replacements for the CP III, does anything need adjusting if I use them?

I saw and interesting blog post about using A3144 hall effect sensors as end stops, anyone else tried them? As they are really cheap I think I might get some to play with.

Lets see if we can keep the build time under 2 years. ;)

Regards,

Les

Hi Les,

I attach an OpenScad model of the IR sensor. There are some designed for printable mounts linked to in the fitting instructions at [miscsolutions.wordpress.com].

I have the Robotdigg 2020 aluminium corners. They look very similar to printed corners, however my previous printed corners were for 1515 extrusion, so I can't say whether they are direct replacements for standard printed 2020 Kossel corners.

I have found microswitch endstop sensors to be entirely adequate and very reproducible - but I guess it depends on the quality of the microswitch and how you use them.

HTH David]]> dc42 Delta Machines Sun, 24 Jul 2016 19:07:16 -0400 https://reprap.org/forum/read.php?178,361141,691370#msg-691370 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691370#msg-691370
The optical end point sensors are similar to these :- [www.ebay.co.uk]

They have been amazing, I had nothing but issues with the mechanical end stop, you would do a calibration, re-run and it would all be different. Pretty much exactly the same now on each pass with the optical ones. If fact I would say with the optical sensors there isn't a huge need for the auto calibration.

Regards

Matt]]> Matt,Wheatley Delta Machines Sun, 24 Jul 2016 12:38:13 -0400 https://reprap.org/forum/read.php?178,361141,691359#msg-691359 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691359#msg-691359
Quote
nka
You might want to look at the BLTouch for the calibration, its a nice little package :)

Not sure about that one.

Quote
Matt,Wheatley
Hi Les, I use the differential IR and optical sensors for the end stops. I hardly ever have to recalibrate.

[drive.google.com]
[drive.google.com]

Regards,

Matt

Thanks Matt what optical sensors are they and how accurate are you finding them?

Having played about with the heated bed today, I have come to the conclusion that its a pile of sh*te. It can barely get up to 65deg and takes ages to get there. Any suggestion on a circular heated bed, preferably 12v and 240mm dia. As I am only going to be using PLA on this machine, it doesn't need to reach super high temps. (The Smoothieboard connectors are rated at 12amp)

Les]]> Pointy Delta Machines Sun, 24 Jul 2016 11:42:40 -0400 https://reprap.org/forum/read.php?178,361141,691332#msg-691332 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691332#msg-691332
[drive.google.com]
[drive.google.com]

Regards,

Matt]]> Matt,Wheatley Delta Machines Sun, 24 Jul 2016 08:32:22 -0400 https://reprap.org/forum/read.php?178,361141,691315#msg-691315 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691315#msg-691315 nka Delta Machines Sun, 24 Jul 2016 07:13:29 -0400 https://reprap.org/forum/read.php?178,361141,691309#msg-691309 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,691309#msg-691309
From memory it's pretty much ready to go, I just have to fit the heated bed and finish the new belt driven extruder. I also remember it being a real pain to calibrate, so I think a Z probe is in order, After catching up with 20 odd pages of this thread, it seems there are 2 sensible options, DC's mini IR board or the inductive sensor. The inductive sensor looks really big and heavy and is going to be harder to get close to the nozzle than DC's board, so at the moment I am swaying towards the latter. Do you have a CAD model or Tech drawing of your board Dave, so I can see how I can mount it?

I have seen Aluminium Corners mentioned, are they just direct replacements for the CP III, does anything need adjusting if I use them?

I saw and interesting blog post about using A3144 hall effect sensors as end stops, anyone else tried them? As they are really cheap I think I might get some to play with.

Lets see if we can keep the build time under 2 years. ;)

Regards,

Les]]> Pointy Delta Machines Sun, 24 Jul 2016 06:14:00 -0400 https://reprap.org/forum/read.php?178,361141,654343#msg-654343 Re: Cherry Pi III Is Available https://reprap.org/forum/read.php?178,361141,654343#msg-654343
Hi gang.

My Cherry PI has been printing for a while, but I've been struggling over the last few weeks to get it really dialed in. I built and measured everything as carefully as I can, but I could still only print on center 100mm or so. I could not get the nozzle to track the whole bed reliably.

In my frustration I installed an inductive probe and tried Cattel's auto calibrator (testing fork) without success.

Finally I discovered this site:

[escher3d.com]

It does the same math used in the ARM-based RepRapFirmware, but spits out the numbers to be manually installed in other firmware types, including those that run on low-computing-power hardware like RAMPS. I used Cattel's fork, simply because it has convenient way to enter the tower rotation parameters, which were key in my case. (The latest Marlin 1.1 fork has most of the support under the hood, but maddeningly does not expose it in M665/666).

I followed the steps listed on the calculator page. Step 5 instructs us to 'measure the nozzle height errors' which is a bit light on specifics, perhaps because printers and firmware types vary. In more detail, here's the method I used:

Get your printer geometry ready. For my CherryPI, I used:

Diagonal rod 230
Delta radius 123
Homed height 250
- these are the same values in my configuration.h

The homed height is deliberately a bit smaller than measured, to ensure that our first pass doesn't crash into the bed.

Leave endstops and angular corrections zero

printable radius 90 (you might be able to go a smidge higher)
probe points 10
factors 6

* Click the 'suggest points' button. The first 6 points are at 12, 2, 4, 6, 8, and 10 o'clock on the radius you entered. The next three are at 12, 4, and 8 o'clock on half that radius. The final point is at the center.

* Program buttons in Pronterface to move to these X, Y points at Z = 5mm. You'll have to measure all these points at least three times, so I think it's worth the trouble to make the buttons. For example, my 'point 2' button is programmed to:

g0 F8000 x77.94 y-45 z5

* For convenience, I programmed another button to issue M114 (get position) followed by G28 (home all).

* Measure each point like so:

- Click the corresponding button you just programmed. The head will move to a point just above the measurement point.

- With a paper feeler gage ready, use the Z move buttons to sneak down to the bed.** As soon as it drags, click your 'get position' button or enter M114. Then click home.

- Negate the Z position reported by M114 to get the value to punch into the calculator.

* When all points are entered, click calculate. It spits out the M666 command for you. Copy & paste that into Pronterface; then enter M500 and M501 to save the values to EEPROM.

* Click 'copy to initial parameters' which enters those same M666 values into the top fields of the calculator to prepare for the next pass.

* Repeat the last 3 steps once more.

* Repeat the measurement step again. This time, you'll probably notice that your measurements are very close. Mine were all within .2mm, so I didn't bother going any further. I suppose you could keep going and see if it converges any more.

* Save the results of the last M501 command (or issue M503), in a text file somewhere, in case you have to restore your EEPROM.

That's it! While it might sound laborious, I found it faster and more accurate than anything else I've tried. If you're struggling as I was, give it a shot!

-Matt

** I actually created two 'micromove' buttons that move up and down by 0.02 mm to make this step more accurate. I'm not sure how much accuracy it really adds: the minimum theoretical microstep move is 0.0125, and microstepping is generally not as accurate in practice as in theory. Also, the M114 command reports back only two decimal places. Still, if you want to try it my way, here are the commands:

microdown:
G91
G0 Z-0.02 F3000
G90

microup:
G91
G0 Z0.02 F3000
G90]]> mkeveney Delta Machines Tue, 19 Apr 2016 15:55:53 -0400