D-Bot 3D Printer

[tekkydave]

There's an item there that explains Gina's problem using Cura

https://betrue3d.dk/using-duet-with-cura-and-diamond-hotend-and-firmware-retract/

 

[Dr_Ju_ju]

I've even resorted to printing out the accepted Gcodes pages, as it was getting tedious to find the correct code & how to configure it...

[tekkydave]

I've now removed the redundant front bar on the z carriage as it no longer carries any wheels. It doesnt seem to have had any effect on the stability or rigidity of the bed. 

I also printed some 4020 end caps to make the extrusion ends a bit more attractive

 

 

[Gina]

I don't have a front or a back bar on my Mini but then I'm using 4 cords to support the bed in the Z direction.  And you're using a different wheel arrangement for your Z carriage, Dave.  Might be better than mine.

[tekkydave]

The 24V extruder heater cartridge & fans arrived today. If the PSU takes a while to arrive I can use my bench supply as a temporary measure. The hotend fan shroud is starting to disintegrate on the corners where the screws attach the fan so I might order a replacement.

[tekkydave]

I now have the Duet running on 24V from my bench supply. I rebuilt the hotend with a new-style E3D heat block. I've had this ready to fit for a couple of weeks. I previously had the old-style blocks with the tiny hole for the thermistor. I was never confident the thermistor got an accurate reading with these. The new blocks use a thermistor cartridge which is clamped in the block.

Ive fitted a 24v 60w heater cartridge and 24v cooling fan. The part-cooling fan has also been upgraded to a 24v part. The 24v fans seem to be a lot more powerful then the 12v fans on 12v.

E3D also supply 3 socks with the heating block so I fitted one of those too.

 

[Gina]

Ah yes... I must order some 24v fans for my Giant printer.  I might change my Titan printer to 24v too - not sure yet.  I'll get the Duet working on it first, with 12v main supply.

[tekkydave]

Test Benchy. PLA at 215C, 0.2mm layer height, 0.4mm nozzle

 

[Gina]

No scale - what size is the print?

[tekkydave]

Its 48mm high

 

[Dr_Ju_ju]

Heads up, I was having issues trying to configure the Titan Aero, and came across this https://e3d-online.com/blog/2018/01/22/bearinggate/, which explains why my Aero has started missing steps & screeching, so I'm waiting for some new Igus bearings 

[tekkydave]

I'm pretty sure my Titan doesn't have this issue but I've sent in a request for a replacement anyway - just in case

I always put a tiny amount of silicon grease on the front & rear bearings of the extruder hob whenever I have it apart.

[Gina]

I had a cover crack some time ago but it was before the period of the problem - I though it was my fault for over tightening the screw, which I'm sure it was.  Not sure if I bought a Titan extruder in the time period they said but I'll keep a lookout for the problem.  Nothing seen so far.  I tend not to mix lubricants as I'm not an expert on lubricant chemistry.

[tekkydave]

I think my Titan is a newer model (purchased Feb 2017) without proper bearings. The hob wheel shafts appear to be just sitting on bushings. I think thats why they tell you not to tighten the top right screw. I never noticed any lubricant on it when I first got it.

[Gina]

All mine have the tiny ball bearings so probably pre Feb 2017.  I may be buying another to make my Giant a dual extruder jobby but in view of the problem I'll hold off until E3D have their proper solution to their problem.  Haven't decided yet just how to arrange two extruders and a Z probe to minimise lost printing area.  I know they do a mirror image version so two extruders could go side by side though maybe front to front may be better rotated 90° to normal with the motors sticking out the sides.  But I digress...

[tekkydave]

I'll have a closer look at mine next time I have it apart - maybe it does have small bearings in there that I just didnt notice.

[Gina]

Re. Duet setup.  I'm trying to get my second Duet WiFi board working.  I have used the online configuration tool to configure the Duet for my Titan printer and downloaded it.  I went through the WiFi setup from Repetier Host and it connected to my new AP just fine.  Then I uploaded the new config.zip and rebooted the Duet from Firefox but now it's asking for a password in order to connect!  I have not had this before and have no idea what password - anyone here have any suggestions?  I've looked in the wiki but can't find anything.  I have my Mini printer Duet connected (printing parts for my Giant printer) at the same time but shouldn't make any difference - they have different IP addresses.

Edited January 31, 2018 by Gina

[tekkydave]

It will be in your config.g somewhere.

[tekkydave]

See the Prologue and communications section on this page

https://www.duet3d.com/wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer

M551 is the gcode you are looking for.

Edited January 31, 2018 by tekkydave

[Gina]

It isn't set.  I tried "reprap" as that seemed to be the default but it didn't work.  Guess I could try setting it from USB.

[Gina]

Tried sending "M551 Preprap" to the Duet from Repetier Host but "reprep" still doesn't work

[Gina]

Hmm...  Rebooted by disconnecting from USB and reconnecting.  Then sent "M551 Preprap" again.  After that the web page connected without asking for a password   Very strange but problem solved

[tekkydave]

I think some changes need a reboot to take effect. Also config.g only gets executed once at boot time. Doesn't explain your issue or why it fixed itself though

 

[Gina]

Took the third Duet board out of it's packaging and connected to USB.  Set up WiFi, connected from Firefox and uploaded config.zip previously set up for my Giant printer and downloaded, followed by the firmware update.  All working fine powered from USB.  Having remembered from last time, the process proceeded smoothly and easily   So that's ready for when I connect it to my Giant printer.

Edited January 31, 2018 by Gina

[tekkydave]

Today I installed a white LED strip as per the original D-Bot design. As it is a 12V strip I supplied it from a buck converter.

Also visible is the cable drag chain I printed from a design on Thingiverse.

I made sure the cut end was well insulated with a piece of heat-shrink.

By connecting the -ve side of the LED strip to the -ve pin on FAN2 on the Duet I can use the M106 g-code to control the brightness.

This works as the Duet Fan Mosfets switch the load to ground. The buck converter ground is common to the Duet's ground completing the circuit.