Daid and Berend, thanks for your replies!
The Ultimaker has been delivered dec 2011 and has the PCB 1.5.4. Does that influence the replies?
I tried the RepG firmware Upgrade variant (easier for me). The compile and upload variant seems difficult for a starter, but I can try.
At the Google forum, someone advised me to use Marlin v2 (that should work via RepG).
http://groups.google.com/group/ultimake ... 5afeae5354
Is this more fool-proof than the ErikZalm-version?
I use the software combination Netfabb - RepG (v26). Can Netfabb handle the "Software end stops" (multiply) automatically? If not, which are the exact gcodes at the start?