Slow Unload Speed after Extruder change to a Bondtech 3:1 Gear
Hello Guys.
I have a Problem with the unload speed after the Extruder change to the new Bondtech 3:1 Gear.
At the beginning from the Unload, the stepper run realy slow (should be fast at this Point) and at the End the stepper rans stupid fast (should be slow)
Martin from Bondtech help me and said i have to change the Unload Speed in the Firmware.
But ... i have no Clue how to change the FW.
Are there a nice Person out there would like to help me?!
Ps. The Extrution of the new 3:1 Extruder is awesome, onley the unload sucks 🙂
Greetings from Austria/Tirol
RE: Slow Unload Speed after Extruder change to a Bondtech 3:1 Gear
If your still interested. Here's how:
1. Go to https://github.com/prusa3d/Prusa-Firmware and follow instructions on how to configure arduino-ide to edit prusa firmware.
2. Edit Ultralcd.cpp search for line:
void unload_filament()
unload speed settings are in lines:
current_position[E_AXIS] -= 45;
plan_buffer_line_curposXYZE(5200 / 60, active_extruder);
st_synchronize();
current_position[E_AXIS] -= 15;
plan_buffer_line_curposXYZE(1000 / 60, active_extruder);
st_synchronize();
current_position[E_AXIS] -= 20;
plan_buffer_line_curposXYZE(1000 / 60, active_extruder);
st_synchronize();
where unload speed are set in 3 steps to 5200, 1000 and 1000
I had to change the speeds because of huge problem with stringing during unload.
RE: Slow Unload Speed after Extruder change to a Bondtech 3:1 Gear
That's exactly the information I'm looking for right know. But the question is: What speeds did you use?
RE: Slow Unload Speed after Extruder change to a Bondtech 3:1 Gear
After upgrading to bondtech extruder I started having problem with stringing during unload. Changing the first speed value to 15600 worked most of the time, and in the end I've set:
current_position[E_AXIS] -= 45;
plan_buffer_line_curposXYZE(20800 / 60, active_extruder);
Have you tried the new bondtech firmware for prusa?
https://github.com/BondtechAB/Bondtech_Prusa_i3/tree/master/Firmware/3.8.0
In the release readme among other things they changed:
"Adjusted Load/Unload filament sequence", and you can install it using prusa slicer 🙂
RE: Slow Unload Speed after Extruder change to a Bondtech 3:1 Gear
I didn't change anything but set the microsteps for e to 16 and steps for e to 415. That fixed the unloading issue for me. Maybe I'll give the other changes from the Bondtech firmware a try...