alright guys.. enough. It is NOT hard to do this.
Those of us that have/had Solidoodles KNOW that the stock hotend temp settings are not "typical" of most.
For mine, the stock hotend temp for PLA was in the 165c range, ABS was in the 195C range.. those were the settings that worked for me, on my machine, without issues.
So, taking the "actual" temp settings with a grain of salt... no, on the stock hotend, one did not use 245C.
I cannot believe I am saying this, but Yizhou.he is (gulp) correct - you use the higher temp setting to start with.
When switching from PLA to ABS... set the temp to YOUR machine's required temp for ABS, turn it on.. as SOON as the temp is high enough for the PLA, start extuding it to purge the hotend. This way it does not get burned and cause a clog. continue extruding until all the PLA has been purged and you get clean ABS coming out.
When switching from ABS to PLA - again, set the temp for the ABS, when hot enough start extruding until you get PLA coming out, then immediately turn the temp down to the correct setting for YOUR machine. Extrude more so that any possibly overheated material is expelled.
Done.
Do NOT leave the machine unattended and hot when doing the changeover. You need to be paying attention to it and what is coming out of the hotend at what temperature.
For those that STILL have issues doing this, there is a "cleaning" material you can use in between materials to completely purge one before starting another. I, personally, have only used it a couple of times and only because a friend sent me a sample of it to try, but it is out there and it does work.
you do NOT have to change your hotend to be able to do this. A little common sense will go a long way.
SD4 #1 & #2 - Lawsy carriages, E3D v6, Rumba controller board, mirror bed plate, X motor fan, upgraded PSU & Mica bed heater
SD4 #3 - in the works ~ Folgertech FT-5, rev 1
Printit Industries Beta Tester - Horizon H1