TEVO Little Monster Duet Ethernet Conversion

A Former User

Hi dc42 you wrote
"It's usually possible to convert 5V optical endstops to 3.3V. Identify the resistor in series with the IR emitter in the slotted opto switch and reduce its value by about 50%. If it's a surface mount resistor and you don't have SMD desoldering equipment then it's easiest to solder a second resistor of equal value on top of the existing one." Are you able to explain this in more detail. I have two optical endstops that are 5V that i need to turn into 3.3v. I read another article of your that I will need BAT43 diodes (which I have ordered) but can you show me an image or describe how this works please

dc42

If you convert the endstops to work on 3.3V then you don't need the diodes, they are for endstops that need higher voltages.

If you post photos of your opto endstops then I will try to help.

A Former User

Sorry there not opto sensors, I meant to say proximity sensors.

https://imgur.com/FmQV2nM

dc42

In that case, assuming they are designed to run from 5V, you may need to connect the ground pin of the sensor to ground on the Duet endstop connector, the output of the proximity sensor to the STP pin of the endstop connector via the diode (cathode of the diode goes to the sensor output), and the +5V connection from the sensor to +_5V on the Duet. You can find +5V on the expansion connector. But from reading posts from other users, it appears that some of them got the sensors working on 3.3V.

A Former User

But from reading posts from other users, it appears that some of them got the sensors working on 3.3V.
Hi DC42 can you tell me where you read that some people have got it working on 3.3V. I have read numerous articles on this forum and others but I can not seem to find those articles. If I stay with the 5V way that you explained above will I be able to have both the X and Y sensors hooked to the same 5V pin?

dc42

I thought I had seen users running these machines with the endstops powered form 3.3V, but perhaps I was mistaken. Yes you can power multiple endstops from one 5V pin.

mrac1

I've two TLM with the optical sensors on 3.3V, works fine.

dc42

Do some TLMs come with opto sensors and some with prox sensors then?

mrac1

I don't think so, at least I've never seen or heard this.

coleman.joe

Just wondering is your machine silent with the Duet wifi board? I had TMC 2100 on my TLM and just did the duet conversion and it sounds like it did before I put the TMC 2100's in.

mrac1

I gues you've choosen 32 microstepping on all axes? Try 32 on the Extruder and 16 to 256 interpolated on x/y/z.
Config.g:
; Drives
…
M350 E32 I0 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
...

coleman.joe

Do I need to change this as well? When I set it to 16 per your recommendation, the head drives into the bed. Change it back to 32 and it's fine.

M92 X160 Y160 Z160 E837 ; Set steps per mm

coleman.joe

Figured it out. I dropped from the 160 to 80 and it seems to be working like a champ. Thanks for the assist mrac1.

h3rb

I'm going to follow this but I'm also going to take a step forward and modify the effector either replacing with a smart effector or similar. I've removed my flying extruder and done a direct mount:

https://openbuilds.com/builds/tevo-little-monster-direct-mount-extruder.6905/

This relieved some issues I had with the bowden line, however I ended up with an odd jamming issue, where at the top of the throat I would collect liquid goo (perhaps the temp was too high for this ABS) which would solidify effectively creating a blockage.

In the process of removing the blockage, I bent the pin of the BLTouch beyond repair, and began to contemplate why the BLTouch sucks. (The hard plastic of the shell of the BLTouch ought to extend down the pin shaft so it doesn't ever have a chance to bend!) For $45 to replace that's just… lame. So, the Smart Effector is probably a next step. Problem is I now have to design a new way to mount the coldend.

I'm looking forward to doing this conversion. I have yet to actually print with the Tevo Little Monster. I was able to do an extrusion.

Haydn

Is there anyone with a TEVO Little Monster on Maui?
I'd love to see one in operation (or if yours is broken, perhaps I can lend a hand)...

Mahalo!

--Haydn

xubu

I have a tlm and have converted. But I'm have some trouble understanding whats happening and confirming things are right before printing.

I have a duet wifi at firmware 1.17 connected to a 7" paneldue.

I have read and followed information here and at thingiverse. Data in config.zip replaced all that was in /sys (iirc).

I can power on and when it turns on I see/hear the bltouch extend and retract.
I can home and move the head via paneldue. Duet seems to be okay with the default optical end stops provided by tevo. Temperature of bed and hot end is accurate reported through paneldue.

Here are my problems that Im having trouble with understanding.

~~After turning on, the heat bed immediately starts heating and does not stop heating (ive gone to 153 degrees Celsius) before saying that's too much.~~ i wired this wrong. Mks pinout wasnt exactly forthcoming with info. Accidentally swapped main power and heat bed power wiring.
When performing bed leveling, the head stops at the first point. No commands are registered via paneldue and forcing a stop command leaves the paneldue in perpetual "connecting" state.
Unsure if I can send commands through paneldue. I go to console and there's a keyboard icon at the top right. I can tap anything (e.g. G30 for z probe testing) but I see no option to send. Is sending commands reserved for wifi/usb/ethernet connection?

I have not configured wifi settings, I can do this though if it would help.

If this should be in its own thread, i apologize.

dc42

@xubu said in TEVO Little Monster Duet Ethernet Conversion:

When performing bed leveling, the head stops at the first point. No commands are registered via paneldue and forcing a stop command leaves the paneldue in perpetual "connecting" state.

Did you check whether there were any error messages on the Console page of PanelDue?

After you do an Emergency Stop, the Duet has to be reset.

Unsure if I can send commands through paneldue. I go to console and there's a keyboard icon at the top right. I can tap anything (e.g. G30 for z probe testing) but I see no option to send. Is sending commands reserved for wifi/usb/ethernet connection?

To send a command, touch the Enter key, it's the key to the right of the space bar.

xubu

@dc42

I figured half the problem with the bltouch.
My wiring was incorrect. I was using the all 4 z probe pins (connector next to paneldue) + 1 e0 stop pin. Instead, i am now using 2 z probe pins (z probe in and ground) + 3 expansion pins (1, 2, & 8).

With that wiring, the bltouch pin drops and retracts at startup and during calibration of the first point but does not move to the second point. This could be a matter of playing with config.g.

No logging is displayed during calibration.
Really tempted for the Mini IR scanner as a replacement as im not fond of bltouch anyways.

Also, i have tried some simple commands through the paneldue. Pressing the return just clears the line. I cant tell if the duet registers anything. Also, i only have 4 wires connecting my duet (in connector next to z probe on the duet) and paneldue.

xubu

@xubu

I figured out the calibration problem. The other half was tweaking stuff in config.g. looking good so far! Thx!

owesto

Great post I am getting ready to do the same thing to my tevo monster I was hoping to get a copy of your configuration files to give me a good starting place