diff --git a/keyboards/handwired/croxsplit44/config.h b/keyboards/handwired/croxsplit44/config.h
new file mode 100644
index 0000000000..009da2785e
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/config.h
@@ -0,0 +1,53 @@
+/*
+Copyright 2021 Samux6146
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+#define VENDOR_ID       0xB62C
+#define PRODUCT_ID      0x6146
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Samux6146
+#define PRODUCT         splitcustom44
+
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 12
+#define MATRIX_ROW_PINS { D4, D5, D6, D7 }
+#define MATRIX_COL_PINS { B6, B5, B4, D2, C0, C1, F5, F4, F3, F2, F1, F0 }
+
+#define DIODE_DIRECTION COL2ROW
+
+#define RGB_DI_PIN C4
+#ifdef RGB_DI_PIN
+    #define RGBLED_NUM 42
+    #define RGBLIGHT_HUE_STEP 8
+    #define RGBLIGHT_SAT_STEP 8
+    #define RGBLIGHT_VAL_STEP 8
+    #define RGBLIGHT_SLEEP 
+#define RGBLIGHT_EFFECT_BREATHING
+#define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#define RGBLIGHT_EFFECT_SNAKE
+#define RGBLIGHT_EFFECT_KNIGHT
+#define RGBLIGHT_EFFECT_CHRISTMAS
+#define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#define RGBLIGHT_EFFECT_RGB_TEST
+#define RGBLIGHT_EFFECT_ALTERNATING
+#define RGBLIGHT_EFFECT_TWINKLE
+
+#endif
\ No newline at end of file
diff --git a/keyboards/handwired/croxsplit44/croxsplit44.c b/keyboards/handwired/croxsplit44/croxsplit44.c
new file mode 100644
index 0000000000..4dbc7d4cb5
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/croxsplit44.c
@@ -0,0 +1,17 @@
+/* Copyright 2021 Samux6146
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "croxsplit44.h"
diff --git a/keyboards/handwired/croxsplit44/croxsplit44.h b/keyboards/handwired/croxsplit44/croxsplit44.h
new file mode 100644
index 0000000000..c94124f9ee
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/croxsplit44.h
@@ -0,0 +1,32 @@
+/* Copyright 2021 Samux6146
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+#define LAYOUT( \
+	K000, K001, K002, K003, K004, K005, K006, K007, K008, K009, K010, K011, \
+	K100, K101, K102, K103, K104, K105, K106, K107, K108, K109, K110, K111, \
+	K200, K201, K202, K203, K204, K205, K206, K207, K208, K209, K210, K211, \
+	            K302, K303, K304, K305, K306, K307, K308, K309  \
+) \
+{ \
+	{ K000,  K001,  K002,  K003,  K004,  K005,  K006,  K007,  K008,  K009,  K010,  K011 }, \
+	{ K100,  K101,  K102,  K103,  K104,  K105,  K106,  K107,  K108,  K109,  K110,  K111 }, \
+	{ K200,  K201,  K202,  K203,  K204,  K205,  K206,  K207,  K208,  K209,  K210,  K211 }, \
+	{ KC_NO, KC_NO, K302,  K303,  K304,  K305,  K306,  K307,  K308,  K309,  KC_NO, KC_NO }  \
+}
diff --git a/keyboards/handwired/croxsplit44/info.json b/keyboards/handwired/croxsplit44/info.json
new file mode 100644
index 0000000000..e10a390bbd
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/info.json
@@ -0,0 +1,55 @@
+{
+    "keyboard_name": "croxsplit44",
+    "url": "",
+    "maintainer": "Samux6146",
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"label":"K00 (D4,B6)", "x":0.5, "y":1.375},
+                {"label":"K01 (D4,B5)", "x":1.5, "y":1.375},
+                {"label":"K02 (D4,B4)", "x":2.5, "y":1.125},
+                {"label":"K03 (D4,D2)", "x":3.5, "y":1},
+                {"label":"K04 (D4,C0)", "x":4.5, "y":1.125},
+                {"label":"K05 (D4,C1)", "x":5.5, "y":1.25},
+                {"label":"K06 (D4,F5)", "x":13, "y":1.25},
+                {"label":"K07 (D4,F4)", "x":14, "y":1.125},
+                {"label":"K08 (D4,F3)", "x":15, "y":1},
+                {"label":"K09 (D4,F2)", "x":16, "y":1.125},
+                {"label":"K0A (D4,F1)", "x":17, "y":1.375},
+                {"label":"K0B (D4,F0)", "x":18, "y":1.375},
+                {"label":"K10 (D5,B6)", "x":0.5, "y":2.375},
+                {"label":"K11 (D5,B5)", "x":1.5, "y":2.375},
+                {"label":"K12 (D5,B4)", "x":2.5, "y":2.125},
+                {"label":"K13 (D5,D2)", "x":3.5, "y":2},
+                {"label":"K14 (D5,C0)", "x":4.5, "y":2.125},
+                {"label":"K15 (D5,C1)", "x":5.5, "y":2.25},
+                {"label":"K16 (D5,F5)", "x":13, "y":2.25},
+                {"label":"K17 (D5,F4)", "x":14, "y":2.125},
+                {"label":"K18 (D5,F3)", "x":15, "y":2},
+                {"label":"K19 (D5,F2)", "x":16, "y":2.125},
+                {"label":"K1A (D5,F1)", "x":17, "y":2.375},
+                {"label":"K1B (D5,F0)", "x":18, "y":2.375},
+                {"label":"K20 (D6,B6)", "x":0.5, "y":3.375},
+                {"label":"K21 (D6,B5)", "x":1.5, "y":3.375},
+                {"label":"K22 (D6,B4)", "x":2.5, "y":3.125},
+                {"label":"K23 (D6,D2)", "x":3.5, "y":3},
+                {"label":"K24 (D6,C0)", "x":4.5, "y":3.125},
+                {"label":"K25 (D6,C1)", "x":5.5, "y":3.25},
+                {"label":"K26 (D6,F5)", "x":13, "y":3.25},
+                {"label":"K27 (D6,F4)", "x":14, "y":3.125},
+                {"label":"K28 (D6,F3)", "x":15, "y":3},
+                {"label":"K29 (D6,F2)", "x":16, "y":3.125},
+                {"label":"K2A (D6,F1)", "x":17, "y":3.375},
+                {"label":"K2B (D6,F0)", "x":18, "y":3.375},
+                {"label":"K32 (D7,B4)", "x":2.5, "y":4.125},
+                {"label":"K33 (D7,D2)", "x":3.5, "y":4},
+                {"label":"K34 (D7,C0)", "x":4.5, "y":4.5},
+                {"label":"K35 (D7,C1)", "x":5.5, "y":4.75},
+                {"label":"K36 (D7,F5)", "x":12.75, "y":4.75},
+                {"label":"K37 (D7,F4)", "x":13.8, "y":4.375},
+                {"label":"K38 (D7,F3)", "x":15, "y":4},
+                {"label":"K39 (D7,F2)", "x":16, "y":4.125}
+            ]
+        }
+    }
+}
diff --git a/keyboards/handwired/croxsplit44/keymaps/default/keymap.c b/keyboards/handwired/croxsplit44/keymaps/default/keymap.c
new file mode 100644
index 0000000000..7b3805ad63
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/keymaps/default/keymap.c
@@ -0,0 +1,31 @@
+/* Copyright 2021 Samux6146
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+[0] = LAYOUT(
+		KC_ESC, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC, 
+		KC_TAB, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_ENT, 
+		KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_LGUI, 
+		KC_LCTL, KC_LALT, LT(1, KC_NO), KC_SPC, KC_SPC, LT(1, KC_NO), KC_TRNS, KC_TRNS),
+
+[1] = LAYOUT(
+		KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC, 
+		KC_TAB, RGB_MOD, RGB_TOG, KC_TRNS, KC_TRNS, KC_TRNS, RESET, KC_TRNS, KC_TRNS, KC_UP, KC_RGHT, KC_ENT, 
+		KC_LSFT, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_LEFT, KC_DOWN, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_SPC, KC_SPC, KC_TRNS, KC_TRNS, KC_TRNS),
+};
\ No newline at end of file
diff --git a/keyboards/handwired/croxsplit44/keymaps/via/keymap.c b/keyboards/handwired/croxsplit44/keymaps/via/keymap.c
new file mode 100644
index 0000000000..63cd585ab3
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/keymaps/via/keymap.c
@@ -0,0 +1,43 @@
+/* Copyright 2021 Samux6146
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+[0] = LAYOUT(
+		KC_ESC, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC, 
+		KC_TAB, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_ENT, 
+		KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_LGUI, 
+		KC_LCTL, KC_LALT, LT(1, KC_NO), KC_SPC, KC_SPC, LT(1, KC_NO), KC_TRNS, KC_TRNS),
+
+[1] = LAYOUT(
+		KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC, 
+		KC_TAB, RGB_MOD, RGB_TOG, KC_TRNS, KC_TRNS, KC_TRNS, RESET, KC_TRNS, KC_TRNS, KC_UP, KC_RGHT, KC_ENT, 
+		KC_LSFT, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_LEFT, KC_DOWN, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_SPC, KC_SPC, KC_TRNS, KC_TRNS, KC_TRNS),
+
+[2] = LAYOUT(
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+
+[3] = LAYOUT(
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
+		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS) 
+};
diff --git a/keyboards/handwired/croxsplit44/keymaps/via/rules.mk b/keyboards/handwired/croxsplit44/keymaps/via/rules.mk
new file mode 100644
index 0000000000..43061db1dd
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/keymaps/via/rules.mk
@@ -0,0 +1,2 @@
+VIA_ENABLE = yes
+LTO_ENABLE = yes
\ No newline at end of file
diff --git a/keyboards/handwired/croxsplit44/readme.md b/keyboards/handwired/croxsplit44/readme.md
new file mode 100644
index 0000000000..b9eeb305b2
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/readme.md
@@ -0,0 +1,23 @@
+# croxsplit44
+
+![davanti](https://user-images.githubusercontent.com/41386727/131268038-801cb316-7bb1-486d-8432-be5412ddc31b.jpg)
+
+# A 3d printed 44 key handwired split keyboard
+Thanks to ak666666 for the base case layout : https://www.thingiverse.com/thing:4146704
+*
+* Keyboard Maintainer: https://github.com/Samux6146
+* Hardware Supported: handwired, teensy ++ 2.0
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/croxsplit44:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
diff --git a/keyboards/handwired/croxsplit44/rules.mk b/keyboards/handwired/croxsplit44/rules.mk
new file mode 100644
index 0000000000..0b2170c456
--- /dev/null
+++ b/keyboards/handwired/croxsplit44/rules.mk
@@ -0,0 +1,21 @@
+# MCU name
+MCU = at90usb1286
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
\ No newline at end of file