diff --git a/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
index ed5a1c55..ecab4565 100644
--- a/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
@@ -422,7 +422,7 @@
 #define TEMP_MODEL_C_thr 0.01 // C estimation iteration threshold
 #define TEMP_MODEL_C_itr 30   // C estimation iteration limit
 
-#define TEMP_MODEL_R 29.7     // initial guess for heatblock resistance (K/W)
+#define TEMP_MODEL_R 20.5     // initial guess for heatblock resistance (K/W)
 #define TEMP_MODEL_Rl 5       // R estimation lower limit
 #define TEMP_MODEL_Rh 50      // R estimation upper limit
 #define TEMP_MODEL_R_thr 0.01 // R estimation iteration threshold
diff --git a/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
index 5b57bcec..c1767ae1 100644
--- a/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
@@ -426,7 +426,7 @@
 #define TEMP_MODEL_C_thr 0.01 // C estimation iteration threshold
 #define TEMP_MODEL_C_itr 30   // C estimation iteration limit
 
-#define TEMP_MODEL_R 29.7     // initial guess for heatblock resistance (K/W)
+#define TEMP_MODEL_R 20.5     // initial guess for heatblock resistance (K/W)
 #define TEMP_MODEL_Rl 5       // R estimation lower limit
 #define TEMP_MODEL_Rh 50      // R estimation upper limit
 #define TEMP_MODEL_R_thr 0.01 // R estimation iteration threshold