Micro Core (Core XY) 3D Printer

This is quite unique design of Core XY 3D printer.
The concept of this printer is Minimum price, Minimum weight, Maximum size, Maximum speed.

I have made this design to reduce the size as much as possible where as the printing area maximized.

Printable area is 105x105x110 (xyz).
And Frame size is 185x190x255 (13mm Pi metal pipe).

Also I have used 3 Nema 17 motors (X,Y, Extruder), and 28BYJ stepper motor to reduce the total pricing. But still the printing speed is very fast using Nema 17 motors.

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Update on May 30, 2020
Marlin 1.1.x version firmware with configuration uploaded

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Update on Oct 16, 2019

Frame size:
X - 150
Y - 154
Z - 192 (left front - 200, the other 3 are 192)

Bed Frame size:
X - 126
Y - 120

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Below are full list of purchase:
Ramps 1.4 , Mega 2560 R3, 5pcs A4988 Stepper Driver - $16.38
https://www.aliexpress.com/item/32814623554.html?spm=a2g0s.9042311.0.0.27424c4dqq1mtP

GT2 Timing Pulley 16 Tooth 2GT - 2EA, (16T W10 B5 ) - 1.06
https://www.aliexpress.com/item/32950478691.html?spm=a2g0s.9042311.0.0.27424c4d78XKrS

T8 Lead Screw, 150mm With Nut- 2E - $3.82
https://www.aliexpress.com/item/32952885370.html?spm=a2g0s.9042311.0.0.27424c4dxMpgss

6mm linear shaft Rail - 4 EA - (6mm, 20cm) $9.81
https://www.aliexpress.com/item/32903029399.html?spm=a2g0s.9042311.0.0.27424c4dI8BLpf

Rods Axles Bars 3mm x 150mm - 4Ea, $4
https://www.aliexpress.com/item/32962104075.html?spm=a2g0s.9042311.0.0.27424c4dz3IUWm

Shaft Coupler 5mm - 2EA (5x8) $1.4
https://www.aliexpress.com/item/32964188804.html?spm=a2g0s.9042311.0.0.27424c4dORNMjf

GT2 timing belt 1m - $1 (split in half, Type C, treated of teeth cloth)
https://www.aliexpress.com/item/32822761985.html?spm=a2g0s.9042311.0.0.27424c4dLp3xHK

1Set E3D V6 3D Print J-head hotend - $3.17 (I choosen 0.2mm nozzle, 0.4mm is standard.)
https://www.aliexpress.com/item/32911028903.html?spm=a2g0s.9042311.0.0.27424c4dORNMjf

Stepper Motor Gear Motor 28BYJ-48-5V - 2EA $3.5
https://www.aliexpress.com/item/33013995007.html?spm=a2g0s.9042311.0.0.27424c4dvq3sfP

Mk8 Full Metal Extruder - $3.48
https://www.aliexpress.com/item/32917502423.html?spm=a2g0s.9042311.0.0.27424c4dvq3sfP

PTFE Tube - (2x4)$0.72
https://www.aliexpress.com/item/32814232529.html?spm=a2g0s.9042311.0.0.27424c4dWSJudp

nema 17 Stepper Motor - 3EA $21
https://www.aliexpress.com/item/32728425552.html?spm=a2g0s.9042311.0.0.27424c4dlBlOw6

Blower Fan - 1 EA $1.59
https://www.aliexpress.com/item/32820105987.html?spm=a2g0s.9042311.0.0.27424c4dlBlOw6

OLED screen $1.8
https://www.aliexpress.com/item/32896971385.html?spm=a2g0o.productlist.0.0.17f11f54pp53K1&algo_pvid=36008fb0-dd87-4ae1-83de-8cd4fcafbd5e&algo_expid=36008fb0-dd87-4ae1-83de-8cd4fcafbd5e-0&btsid=719478f7-7d44-4c28-8b69-8b3b05ceb262&ws_ab_test=searchweb0_0,searchweb201602_8,searchweb201603_55

Frame : 13mm Pi metal pipe (recycled)

Power: Recycled (Sony, 12V, 4.2A), you can use any type of DC power, just make sure 12V and above 4A.

Bed: I cut glass and put bed sticker. No heating bed but works great with bed sticker.

Stop limit switch - 3EA, recycled.

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Marlin Configuration (for version 1.1.9):
Can be download full version from below URL:
http://marlinfw.org/meta/download/
I have uploaded Configuration.h file.

First enable CoreXY
#define COREXY

Below are the most important part of configuration.
Z motor stepper speed and max feeder rate was quite complicate but using below it worked for me.
#define DEFAULT_AXIS_STEPS_PER_UNIT { 100, 100, 4000, 105.64 }
#define DEFAULT_MAX_FEEDRATE { 400, 400, 0.75, 45 }
#define DEFAULT_MAX_ACCELERATION { 3000, 3000, 5, 300 }

Also for using OLED display:
#define U8GLIB_SSD1306