How do I save acceleration calibration setting?

Snapmaker 2.0
1

The lastest version of firmware and Luban are installed. Luban terminal is communicating with the A350 (single extruder, no other accesories) via USB serial port (COM 6), not Wifi.

I read some posts here on the forum about calibration and folks wrote about how to do that using the Teaching Tech web-site. I got a value for acceleration and want to save that in the SM2 EEPROM.

I type M204 to get the accelaration value:

M204
ok
T:26.40 /0.00 B:20.62 /0.00 T0:26.40 /0.00 T1:0.00 /0.00 @:0 B@:0 @0:0 @1:0
ok
others < Acceleration: P1000.00 R1000.00 T1000.00

I change the value of acceleration:

M204 P750
M204 P750
ok
ok

I check that value has changed

M204
M204
ok
others < Acceleration: P750.00 R1000.00 T1000.00
ok

I save to EEPROM using M500

M500
M500
ok
echo:Settings Stored (1186 bytes; crc 854)
ok

I cycle the power, and check the settings:

M204
M204
ok
T:26.40 /0.00 B:20.62 /0.00 T0:26.40 /0.00 T1:0.00 /0.00 @:0 B@:0 @0:0 @1:0
ok
others < Acceleration: P1000.00 R1000.00 T1000.00

P is back to the default. According to Marlin site, M204 settings are stored using M500.

Where am I going wrong?
Is 750 out of range?
Do I have to connect to the printer via USB to set acceleration each time prior to printing?
Is acceleration no longer required to be calibrated?
Have the developers disabled that function?

2

I may have solved my own problem… there are settings in Luban that deal with acceleration.
The default acceleration is 3000 mm/s^2 on the fast setting.

3

Keep in mind that Snapmaker’s firmware is only BASED on Marlin; there are quite a lot of differences, to include some settings that cannot be changed/saved. It does appear that M204 changes cannot be PERMANENTLY saved to the EEPROM, and must be re-entered with every power cycle. Or, as you discovered, it can much more easily be set in the slicing software.

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