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Attempting to fix what I think is a microstepping issue.

When I enter G1 Z10 F1200 - I expect the hotend to be approximately 10mm from the build surface. However instead it's near the middle of the printer!

I suspected this was a microstep issue (rambo 1.1) so i have changed the configuration.h file of polygonhell's firmware - changing #define MICRO_STEPS 8 to #define MICRO_STEPS 16 and updating the firmware, but it does not appear to have resolved the issue.... help?

cassetti wrote:Attempting to fix what I think is a microstepping issue.

When I enter G1 Z10 F1200 -

I suspected this was a microstep issue (rambo 1.1) so i have changed the configuration.h file of polygonhell's firmware - changing #define MICRO_STEPS 8 to #define MICRO_STEPS 16 and updating the firmware, but it does not appear to have resolved the issue.... help?

"I expect the hotend to be approximately 10mm from the build surface. However instead it's near the middle of the printer!" This doesn't make sense.

cambo3d wrote:

cassetti wrote:Attempting to fix what I think is a microstepping issue.

When I enter G1 Z10 F1200 -

I suspected this was a microstep issue (rambo 1.1) so i have changed the configuration.h file of polygonhell's firmware - changing #define MICRO_STEPS 8 to #define MICRO_STEPS 16 and updating the firmware, but it does not appear to have resolved the issue.... help?

"I expect the hotend to be approximately 10mm from the build surface. However instead it's near the middle of the printer!" This doesn't make sense.

Doesn't Z10 set the carriage to 10 mm? Right? Z0 would be the first print layer, correct?

what you say doesn't make sense because your comparing height to position.

do you mean the middle in height? when you say middle of the printer

Here's another example of the problem

G1 Z0 F1200 sends the printer to this position - exactly 200mm above the print surface
[img]http://farm9.staticflickr.com/8520/8585 ... 1786_c.jpg[/img]

I cannot reach the bottom of the build surface once I home my printer

I misunderstood what you meant. read through mhackey post to change settings.

cambo3d wrote:I misunderstood what you meant. read through mhackey post to change settings.

If you read my first post, I thought I tried that with defining the microsteps to 16. It didn't fix my issue. I'll re-read his posts, but I thought I did what he did

Don't forget about EEPROM. If you are using that to save settings (which is the default) simply uploading new firmware will NOT make the changes. Verify by looking at the EEPROM settings under the Printer menu. Read the comments in the Configuration.h file about how to use or disable the EEPROM. Or search here for EEPROM and find my many posts telling people how to do this!

What this forum needs is a FAQ.

That can be arranged through a sticky topic. Maybe SeeMeCNC could link that to the forum home page. I have moderator status and can make stickies.

I suspected it was the eeprom - but I don't know what 'printer menu' you're referring to (if it's in the lcd screen - mine is currently kaput). I'll do a search. I suspected as much when I reverted back to 8 microsteps and the effect was the same.

Thanks

cassetti wrote:I suspected it was the eeprom - but I don't know what 'printer menu' you're referring to (if it's in the lcd screen - mine is currently kaput). I'll do a search. I suspected as much when I reverted back to 8 microsteps and the effect was the same.

Thanks

The printer menu is the menu labelled printer in repetier host, there is an option there to open a dialog that displays and allows you to edit the EEPROM settings.