diff --git a/firmware/osape-smoothieroll-drop-stepper/src/config.h b/firmware/osape-smoothieroll-drop-stepper/src/config.h
index 93d31e32c858bd06ac25b072ad835cda5ba0da96..cd398232a2e1a798c50c3547d07acb41803f5e0f 100644
--- a/firmware/osape-smoothieroll-drop-stepper/src/config.h
+++ b/firmware/osape-smoothieroll-drop-stepper/src/config.h
@@ -4,6 +4,9 @@
 //#define UCBUS_IS_HEAD
 #define UCBUS_IS_DROP
 
-#define IS_OG_MODULE
+// if you're using the 'module board' https://gitlab.cba.mit.edu/jakeread/ucbus-module
+// the first (og) revision has an SMT header, and some of the RS485 pins are varied, 
+// set this flag. otherwise, if you have thru-hole JTAG header, comment it out 
+// #define IS_OG_MODULE
 
 #endif 
\ No newline at end of file
diff --git a/firmware/osape-smoothieroll-drop-stepper/src/main.cpp b/firmware/osape-smoothieroll-drop-stepper/src/main.cpp
index 40e678674f32851671f82ae7a1d489bd15750570..590a1e2426a1726eb881e06b3ca05b5790758620 100644
--- a/firmware/osape-smoothieroll-drop-stepper/src/main.cpp
+++ b/firmware/osape-smoothieroll-drop-stepper/src/main.cpp
@@ -12,7 +12,7 @@ uint8_t axis_pick = 0;
 float spu = 400.0F;
 float old_spu = 400.0F;
 volatile boolean spu_was_set = false;
-float c_scale = 0.05F;
+float c_scale = 0.00F;
 #define TICKS_PER_PACKET 25.0F
 #define TICKS_PER_SECOND 50000.0F
 
diff --git a/firmware/osape-smoothieroll-drop-stepper/src/osape-d51 b/firmware/osape-smoothieroll-drop-stepper/src/osape-d51
index e0c99875e43b267a4565cb92ebc74907ee6e1b79..4b8fbfdf4ae987c291b24be77ac4ddab157a545a 160000
--- a/firmware/osape-smoothieroll-drop-stepper/src/osape-d51
+++ b/firmware/osape-smoothieroll-drop-stepper/src/osape-d51
@@ -1 +1 @@
-Subproject commit e0c99875e43b267a4565cb92ebc74907ee6e1b79
+Subproject commit 4b8fbfdf4ae987c291b24be77ac4ddab157a545a