Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

What are your alterations?

Recommended Posts

Hi all,

I'm trying to optimize my alteration files, and I'd like to know how you've tuned it on your side.

This is the alteration files I use with skeinforge 48 and Marlin_v1 firmware, they were found on Ultimaker wiki :

http://wiki.ultimaker.com/Sprinter_firm ... _Ultimaker

* start.gcode: https://raw.github.com/alx/skeinforge-dotfile/master/alterations/start.gcode

(start of start.txt)
M92 E926.5 (the number of extruder steps to take in 1mm of filament)
G21        (metric values)
G21        (all the extra G21 commands are comments - skeinforge eats lines without a gcode)
G90        (absolute positioning)
G28        (move X/Y/Z to min endstops)
G21        ( if your prints start too high, try changing the Z0.0 below )
G21        ( to Z1.0 - the number after the Z is the actual, physical )
G21        ( height of the nozzle in mm. This can take some messing around )
G21        ( with to get just right... )
G92 X-120 Y-120 Z0.2 E0 (reset software position to front/left/z=0.0)
G1 Z15.0 F400  (move the platform down 15mm)
G1 X0 Y0 F3500 (go to the middle of the platform)
G92 E0         (zero the extruded length)
G1 F75 E5     (extrude 5mm of feed stock)
G1 F75 E3.5   (reverse feed stock by 1.5mm)
G92 E0         (zero the extruded length again)
M1             (Clean the nozzle then press YES to continue...)
G1 Z0.0 F400   (back to Z=0 and start the print!)
(end of start.txt)

* end.gcode: https://raw.github.com/alx/skeinforge-dotfile/master/alterations/end.gcode

(start of end.gcode)
M104 S0                (extruder heat off)
M106                   (fan on)
G91                    (relative positioning)
G1 Z+10 E-5 F400       (move Z up a bit and retract filament by 5mm)
G1 X-20 Y-20 F1500     (move X and Y over a bit)
M84                    (steppers off)
G90                    (absolute positioning)
(end of end.gcode)

Share this post

Link to post
Share on other sites
(start of start.txt)M92 E926.5 (the number of extruder steps to take in 1mm of filament)


Might want to change that to E865.888. The 926.5 is what I came up with experimenting with the old-style bolt. Joergan came up with 865.888 on the new-style bolt and I think it works pretty well..

Old bolt vs new bolt pix:

http://wiki.ultimaker.com/Sprinter#Spri ... _and_later


Share this post

Link to post
Share on other sites

My only slightly modified start and end codes [edit] in brief I have increased the speed because it was painfully slow, removed retraction from start.gcode because it was unnecessary, and changed 5mm of extrusion to 10mm because it often takes more than 5mm to prime the nozzle


(start of start.txt)G21				(metric)G90				(absolute positioning)G28				(home all axes to min endstops)G92 X-105 Y-105 Z0.0 E0 (reset position to front/left/z=0)G1 Z10.0 F500	(move the platform down 10mm)G1 X0 Y0 F1600	(go to the middle of the build volume/platform)G92 E0			(zero the extruded length)G1 F600 E10		(extrude some filament)G92 E0			(zero the extruded length again)G1 Z0.0 F500	(back to Z=0)(end of start.txt)



(start of end.gcode!)M104 S0				(extruder heat off)M106				(fan on)G91					(relative positioning)G1 Z+10 E-2 F1600	(move Z up a bit and retract filament)G1 X-30 Y-30 F1500	(move X and Y over a bit)G90					(absolute positioning)M18					(steppers off)(end of end.gcode)


I am not using an M92 in the alteration files because it is in the firmware

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Our picks

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 86 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!