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GTM32-Pro source code.

Posted: Mon Jan 30, 2017 9:51 am
by dwalsh62
I've been trying to weed through the site to find the source code for the GTM32-Pro controller and all I can find are flashable hex files that are not suitable for my intended delta application.

While I think the 301 is basically a nice platform, a larger work area (300mm x 460mm) and hiwin linear rail version is what I want to build and since I'm using 40mm 110VAC servo motors with 10,000ppr encoders, resolution is by far better than the nema17 could every provide and precision would not be affected by speed and lost steps would not be a concern.

I have completed testing my silicon nitride ceramic coated Diamond 3-in-1-out head with a 0.28mm nozzle and I couldn't get the nozzle to clog one time under any condition and the ceramic actually helped to stabilize the nozzle temperature as well as provide a non-stick coating so it's definitely an improvement over straight brass.

Some modifications and updates to the firmware will definitely be required and expecting Geeetech to do it would take far too long than I care to wait and then waiting on small tweaks would make me want to beat someone to near death so I need the source to do it myself and maintain my sanity.

Re: GTM32-Pro source code.

Posted: Wed Feb 08, 2017 6:02 pm
by bang
I guess the source code is not available for us...
It seems Geeetech doesn't open the source. :roll:

Re: GTM32-Pro source code.

Posted: Thu Feb 09, 2017 8:56 pm
by dwalsh62
Yes this is unfortunate and it makes this controller unsuitable for anything but their own printer which I wouldn't consider a high quality printer but does a decent job all things considered, the only really nice feature is that it can print in any color by RGB mixing on the fly, the AVR Mega based (1280/2560) controller don't seem to be able to do anything more than about a 16 color pallet and not very well.

I've tested the Rostock 301 printer and while it performed very well for small objects, auto-leveling isn't very good due to the resolution and the granularity of printed products is less than desirable on larger parts.

I found the print area just isn't suitable for most objects at 160mm DIA x 250mm tall and yes I know it should be 180mm DIA but at this DIA the part doesn't print correctly due to the hot-plate so after examining most of the parts I've worked on increasing this to 250mm DIA x 250mm tall (using a 280mm DIA hot-plate) would make the printer suitable for my application.

I made the printer with 15mm HiWin linear rails, calculated the length of the arms to maintain the same movement geometry per nozzle aperture size, made an aluminum extruder plate to replace the plastic injected part, connected the board and it doesn't print in the full print area and since I have a finer print resolution with the updated extruder nozzle the code needs to be adjusted as the parts are coming out about 70% smaller (scaled down) than they should be since it's expecting a 0.4mm aperture nozzle and I've got 0.28mm aperture nozzle.